diff --git a/make/autoconf/flags-cflags.m4 b/make/autoconf/flags-cflags.m4
index c96b289084c..97a3ec14ecd 100644
--- a/make/autoconf/flags-cflags.m4
+++ b/make/autoconf/flags-cflags.m4
@@ -459,7 +459,7 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_HELPER],
     CFLAGS_OS_DEF_JVM="-D_ALLBSD_SOURCE -D_DARWIN_C_SOURCE -D_XOPEN_SOURCE"
     CFLAGS_OS_DEF_JDK="-D_ALLBSD_SOURCE -D_DARWIN_UNLIMITED_SELECT"
   elif test "x$OPENJDK_TARGET_OS" = xaix; then
-    CFLAGS_OS_DEF_JVM="-DAIX -Dalloca'(size)'=__builtin_alloca'(size)' -D_LARGE_FILES"
+    CFLAGS_OS_DEF_JVM="-DAIX -D_LARGE_FILES"
     CFLAGS_OS_DEF_JDK="-D_LARGE_FILES"
   elif test "x$OPENJDK_TARGET_OS" = xbsd; then
     CFLAGS_OS_DEF_JDK="-D_ALLBSD_SOURCE"
diff --git a/src/hotspot/share/utilities/globalDefinitions_gcc.hpp b/src/hotspot/share/utilities/globalDefinitions_gcc.hpp
index 4267cdb2746..e5decbcd536 100644
--- a/src/hotspot/share/utilities/globalDefinitions_gcc.hpp
+++ b/src/hotspot/share/utilities/globalDefinitions_gcc.hpp
@@ -31,6 +31,7 @@
 // globally used constants & types, class (forward)
 // declarations and a few frequently used utility functions.
 
+#include <alloca.h>
 #include <ctype.h>
 #include <inttypes.h>
 #include <string.h>