diff --git a/hphp/compiler/code_generator.h b/hphp/compiler/code_generator.h
index 138886767..7e14f251f 100644
--- a/hphp/compiler/code_generator.h
+++ b/hphp/compiler/code_generator.h
@@ -308,7 +308,7 @@ private:
   public: void print(const char *msg, bool indent = true);
 
  private:
-  void print(const char *fmt, va_list ap);
+  void print(const char *fmt, va_list ap) ATTRIBUTE_PRINTF(2,0);
   void printSubstring(const char *start, int length);
   void printIndent();
   std::string getFormattedName(const std::string &file);
diff --git a/hphp/runtime/ext/ext_image.cpp b/hphp/runtime/ext/ext_image.cpp
index 01678afef..c010c646a 100644
--- a/hphp/runtime/ext/ext_image.cpp
+++ b/hphp/runtime/ext/ext_image.cpp
@@ -1062,11 +1062,13 @@ static int get_php_tiff_bytes_per_format(int format) {
 #define TAG_FMT_DOUBLE    12
 
 static int php_vspprintf(char **pbuf, size_t max_len,
-                         const char *format, ...) {
+                         const char *fmt, ...) ATTRIBUTE_PRINTF(3,4);
+static int php_vspprintf(char **pbuf, size_t max_len,
+                         const char *fmt, ...) {
   va_list arglist;
   char *buf;
-  va_start(arglist, format);
-  int len = vspprintf_ap(&buf, max_len, format, arglist);
+  va_start(arglist, fmt);
+  int len = vspprintf_ap(&buf, max_len, fmt, arglist);
   if (buf) {
 #ifdef IM_MEMORY_CHECK
     *pbuf = php_strndup_impl(buf, len, __LINE__);
@@ -1080,9 +1082,11 @@ static int php_vspprintf(char **pbuf, size_t max_len,
 }
 
 static int php_vspprintf_ap(char **pbuf, size_t max_len,
-                            const char *format, va_list ap) {
+                            const char *fmt, va_list ap) ATTRIBUTE_PRINTF(3,0);
+static int php_vspprintf_ap(char **pbuf, size_t max_len,
+                            const char *fmt, va_list ap) {
   char *buf;
-  int len = vspprintf_ap(&buf, max_len, format, ap);
+  int len = vspprintf_ap(&buf, max_len, fmt, ap);
   if (buf) {
 #ifdef IM_MEMORY_CHECK
     *pbuf = php_strndup_impl(buf, len, __LINE__);
diff --git a/hphp/runtime/vm/class.cpp b/hphp/runtime/vm/class.cpp
index 34ee89c9d..3346c5b5a 100644
--- a/hphp/runtime/vm/class.cpp
+++ b/hphp/runtime/vm/class.cpp
@@ -652,8 +652,7 @@ void Class::initInstanceBits() {
       i = 1;
       for (auto& pair : counts) {
         if (i >= 256) {
-          Trace::traceRelease("skipping the remainder of the %" PRIu64
-                              " classes\n",
+          Trace::traceRelease("skipping the remainder of the %zu classes\n",
                               counts.size());
           break;
         }
diff --git a/hphp/runtime/vm/jit/translator-x64.cpp b/hphp/runtime/vm/jit/translator-x64.cpp
index 29c40511b..90a27bae2 100644
--- a/hphp/runtime/vm/jit/translator-x64.cpp
+++ b/hphp/runtime/vm/jit/translator-x64.cpp
@@ -2307,8 +2307,8 @@ TranslatorX64::enterTC(TCA start, void* data) {
       start = TCA(0xbee5face);
     }
 
-    TRACE(2, "enterTC: request(%s) args: %" PRIx64 " %" PRIx64 " %"
-             PRIx64 " %" PRIx64 " %" PRIx64 "\n",
+    TRACE(2, "enterTC: request(%s) args: %" PRIxPTR " %" PRIxPTR " %"
+             PRIxPTR " %" PRIxPTR " %" PRIxPTR "\n",
           reqName(info.requestNum),
           info.args[0], info.args[1], info.args[2], info.args[3],
           info.args[4]);
@@ -3050,7 +3050,7 @@ TranslatorX64::checkTranslationLimit(SrcKey sk,
     INC_TPC(max_trans);
     if (debug && Trace::moduleEnabled(Trace::tx64, 2)) {
       const vector<TCA>& tns = srcRec.translations();
-      TRACE(1, "Too many (%" PRId64 ") translations: %s, BC offset %d\n",
+      TRACE(1, "Too many (%zd) translations: %s, BC offset %d\n",
             tns.size(), curUnit()->filepath()->data(),
             sk.offset());
       SKTRACE(2, sk, "{\n");
@@ -3817,12 +3817,12 @@ std::string TranslatorX64::getUsage() {
     TargetCache::s_persistent_frontier - TargetCache::s_persistent_start;
   Util::string_printf(
     usage,
-    "tx64: %9zd bytes (%" PRId64 "%%) in ahot.code\n"
-    "tx64: %9zd bytes (%" PRId64 "%%) in a.code\n"
-    "tx64: %9zd bytes (%" PRId64 "%%) in astubs.code\n"
-    "tx64: %9zd bytes (%" PRId64 "%%) in m_globalData\n"
-    "tx64: %9zd bytes (%" PRId64 "%%) in targetCache\n"
-    "tx64: %9zd bytes (%" PRId64 "%%) in persistentCache\n",
+    "tx64: %9zd bytes (%zd%%) in ahot.code\n"
+    "tx64: %9zd bytes (%zd%%) in a.code\n"
+    "tx64: %9zd bytes (%zd%%) in astubs.code\n"
+    "tx64: %9zd bytes (%zd%%) in m_globalData\n"
+    "tx64: %9zd bytes (%zd%%) in targetCache\n"
+    "tx64: %9zd bytes (%zd%%) in persistentCache\n",
     aHotUsage,  100 * aHotUsage / ahot.code.size,
     aUsage,     100 * aUsage / a.code.size,
     stubsUsage, 100 * stubsUsage / astubs.code.size,
diff --git a/hphp/runtime/vm/jit/translator-x64.h b/hphp/runtime/vm/jit/translator-x64.h
index 2688d1504..b90dbe38c 100644
--- a/hphp/runtime/vm/jit/translator-x64.h
+++ b/hphp/runtime/vm/jit/translator-x64.h
@@ -636,7 +636,7 @@ struct SpaceRecorder {
     if (Trace::moduleEnabledRelease(Trace::tcspace, 1)) {
       ptrdiff_t diff = m_a.code.frontier - m_start;
       if (diff) {
-        Trace::traceRelease("TCSpace %10s %3" PRId64 "\n", m_name, diff);
+        Trace::traceRelease("TCSpace %10s %3td\n", m_name, diff);
       }
     }
   }
diff --git a/hphp/runtime/vm/unit.cpp b/hphp/runtime/vm/unit.cpp
index 8110970d7..5d68cd3f4 100644
--- a/hphp/runtime/vm/unit.cpp
+++ b/hphp/runtime/vm/unit.cpp
@@ -670,7 +670,7 @@ void Unit::defTypedef(Id id) {
   }
 
   // There might also be a class with this name already.
-  if (Class* cls = nameList->getCachedClass()) {
+  if (nameList->getCachedClass()) {
     raise_error("The name %s is already defined as a class",
                 thisType->name->data());
     return;
diff --git a/hphp/util/db_query.h b/hphp/util/db_query.h
index f03c0b766..4b9ce21bb 100644
--- a/hphp/util/db_query.h
+++ b/hphp/util/db_query.h
@@ -115,7 +115,7 @@ class DBQuery {
    * q.filterBy(q.Format("(%s > 0 or %s = 2)", field1, field2));
    */
   const char *format(const char *fmt, ...) ATTRIBUTE_PRINTF(2,3);
-  const char *format(const char *fmt, va_list ap);
+  const char *format(const char *fmt, va_list ap) ATTRIBUTE_PRINTF(2,0);
 
   /**
    * Use "`" to escape all field names in a comma delimited field list.
diff --git a/hphp/util/neo/neo_hdf.h b/hphp/util/neo/neo_hdf.h
index d866b0a44..c0f6dd045 100644
--- a/hphp/util/neo/neo_hdf.h
+++ b/hphp/util/neo/neo_hdf.h
@@ -146,7 +146,8 @@ char *hdf_get_value (HDF *hdf, const char *name, const char *defval);
  *          The data set maintains ownership of the string, if you want
  *          a copy you either have to call strdup yourself.
  */
-char* hdf_get_valuevf (HDF *hdf, const char *namefmt, va_list ap);
+char* hdf_get_valuevf (HDF *hdf, const char *namefmt, va_list ap)
+                       ATTRIBUTE_PRINTF(2,0);
 
 /*
  * Function: hdf_get_valuef - Return the value of a node in the data set
@@ -359,7 +360,8 @@ NEOERR* hdf_set_value (HDF *hdf, const char *name, const char *value);
  */
 NEOERR* hdf_set_valuef (HDF *hdf, const char *fmt, ...)
                         ATTRIBUTE_PRINTF(2,3);
-NEOERR* hdf_set_valuevf (HDF *hdf, const char *fmt, va_list ap);
+NEOERR* hdf_set_valuevf (HDF *hdf, const char *fmt, va_list ap)
+                         ATTRIBUTE_PRINTF(2,0);
 
 /*
  * Function: hdf_set_int_value - Set the value of a named node to a number
diff --git a/hphp/util/neo/neo_misc.h b/hphp/util/neo/neo_misc.h
index c5e8d498c..d9b875758 100644
--- a/hphp/util/neo/neo_misc.h
+++ b/hphp/util/neo/neo_misc.h
@@ -111,7 +111,8 @@ typedef char BOOL;
 #define FALSE 0
 #endif
 
-void ne_vwarn (const char *fmt, va_list ap);
+void ne_vwarn (const char *fmt, va_list ap)
+               ATTRIBUTE_PRINTF(1,0);
 void ne_warn (const char *fmt, ...)
               ATTRIBUTE_PRINTF(1,2);
 void ne_set_log (int level);