diff --git a/Modules/getbuildinfo.c b/Modules/getbuildinfo.c
index 3312a87c2b1..8e00e4f1e13 100644
--- a/Modules/getbuildinfo.c
+++ b/Modules/getbuildinfo.c
@@ -25,7 +25,7 @@ Py_GetBuildInfo(void)
 {
 	static char buildinfo[50];
 	char *revision = Py_SubversionRevision();
-	char *sep = revision ? ":" : "";
+	char *sep = *revision ? ":" : "";
 	char *branch = Py_SubversionShortBranch();
 	PyOS_snprintf(buildinfo, sizeof(buildinfo),
 		      "%s%s%s, %.20s, %.9s", branch, sep, revision,