diff --git a/gcc/testsuite/gcc.dg/spellcheck-inttypes.c b/gcc/testsuite/gcc.dg/spellcheck-inttypes.c
index 56dc2f3dcfd..1146a7cff5b 100644
--- a/gcc/testsuite/gcc.dg/spellcheck-inttypes.c
+++ b/gcc/testsuite/gcc.dg/spellcheck-inttypes.c
@@ -1,4 +1,8 @@
 /* { dg-options "-std=c99" } */
+/* Prevent AIX from implicitly including inttypes.h.  */
+#ifdef _AIX
+#define _H_INTTYPES_TYPE_TS
+#endif
 #include <stdio.h>
 #include <stdint.h>
 /* Missing <inttypes.h>.  */