diff --git a/src/java.base/macosx/native/libjli/java_md_macosx.m b/src/java.base/macosx/native/libjli/java_md_macosx.m
index d8742aa1204d5..ed99f94623e2a 100644
--- a/src/java.base/macosx/native/libjli/java_md_macosx.m
+++ b/src/java.base/macosx/native/libjli/java_md_macosx.m
@@ -312,12 +312,12 @@ static void MacOSXStartup(int argc, char *argv[]) {
     pthread_t main_thr;
     rc = pthread_create(&main_thr, NULL, &apple_main, &args);
     if (rc != 0) {
-        JLI_ReportErrorMessageSys("Could not create main thread, return code: %s\n", rc);
+        JLI_ReportErrorMessageSys("Could not create main thread, return code:%d\n", rc);
         exit(1);
     }
     rc = pthread_detach(main_thr);
     if (rc != 0) {
-        JLI_ReportErrorMessage("pthread_detach() failed, return code: %s\n", rc);
+        JLI_ReportErrorMessage("pthread_detach() failed, return code:%d\n", rc);
         exit(1);
     }