diff --git a/include/ompi_config_bottom.h b/include/ompi_config_bottom.h
index f195aa246f..5d08d092ae 100644
--- a/include/ompi_config_bottom.h
+++ b/include/ompi_config_bottom.h
@@ -44,7 +44,7 @@ extern bool ompi_mpi_param_check;
 /*
  * Do we have <stdint.h>?
  */
-#if HAVE_STDINT_H
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
 #else
 #include "ompi_stdint.h"
diff --git a/include/ompi_stdint.h b/include/ompi_stdint.h
index a58c1873e6..6d9b3f7833 100644
--- a/include/ompi_stdint.h
+++ b/include/ompi_stdint.h
@@ -21,11 +21,11 @@
  * Include what we can and define what is missing.
  */
 
-#if HAVE_INTTYPES_H
+#ifdef HAVE_INTTYPES_H
 #include <inttypes.h>
 #endif
 
-#if HAVE_SYS_TYPES_H
+#ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif