diff --git a/sign/rpmsignfiles.h b/sign/rpmsignfiles.h
index 2ff623cdf..a21a00612 100644
--- a/sign/rpmsignfiles.h
+++ b/sign/rpmsignfiles.h
@@ -19,7 +19,7 @@ extern "C" {
 RPM_GNUC_INTERNAL
 rpmRC rpmSignFiles(Header sigh, Header h, const char *key, char *keypass);
 
-#ifdef _cplusplus
+#ifdef __cplusplus
 }
 #endif
 
diff --git a/sign/rpmsignverity.h b/sign/rpmsignverity.h
index d869e8d8e..16e6c9857 100644
--- a/sign/rpmsignverity.h
+++ b/sign/rpmsignverity.h
@@ -29,7 +29,7 @@ RPM_GNUC_INTERNAL
 rpmRC rpmSignVerity(FD_t fd, Header sigh, Header h, char *key,
 		    char *keypass, char *cert, uint16_t algo);
 
-#ifdef _cplusplus
+#ifdef __cplusplus
 }
 #endif