diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index 1411ca4e40054e6c983676c4d0eee21fbd2e591c..28b052847534102c06e4aa6b9236b14a41e6a4da 100644
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -2142,7 +2142,7 @@ regression_main(int argc, char *argv[], init_function ifunc, test_function tfunc
 					 SYSTEMQUOTE "\"%s\" -C \"%s/%s\" DESTDIR=\"%s/install\" install >> \"%s/log/install.log\" 2>&1" SYSTEMQUOTE,
 					 makeprog, top_builddir, sl->str, temp_install, outputdir);
 #else
-			fprintf(stderr, _("\n%s: --extra-install option not supported on this platform\n", progname));
+			fprintf(stderr, _("\n%s: --extra-install option not supported on this platform\n"), progname);
 			exit_nicely(2);
 #endif