diff --git a/src/utils/ncmpidump/ncmpidump.h b/src/utils/ncmpidump/ncmpidump.h
index 1d1604f543..84246f7767 100644
--- a/src/utils/ncmpidump/ncmpidump.h
+++ b/src/utils/ncmpidump/ncmpidump.h
@@ -20,7 +20,7 @@
 typedef bool boolean;
 #else
 typedef int boolean;
-#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 202311L
+#if !defined(__cplusplus) && (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 202311L)
 enum {false=0, true=1};
 #endif
 #endif
diff --git a/test/common/testutils.h b/test/common/testutils.h
index 38d6f8f9ec..b444d2ece5 100644
--- a/test/common/testutils.h
+++ b/test/common/testutils.h
@@ -22,7 +22,7 @@
 typedef bool boolean;
 #else
 typedef int boolean;
-#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 202311L
+#if !defined(__cplusplus) && (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 202311L)
 enum {false=0, true=1};
 #endif
 #endif