diff --git a/tools/version_policy.c b/tools/version_policy.c
index 74c9c73..24b2a3c 100644
--- a/tools/version_policy.c
+++ b/tools/version_policy.c
@@ -87,6 +87,7 @@
 	char *base = NULL;
 	char *tgt_policy = NULL;
 	char *num = NULL;
+	char *dot;
 	char *output = NULL;
 	struct cil_db *base_db = NULL;
 	struct cil_db *out_db = NULL;
@@ -138,6 +139,13 @@
 		usage(argv[0]);
 	}
 
+	/* policy language doesn't like '.', so replace them with '_' in mapping version */
+	dot = num;
+	while ((dot = strchr(dot, '.')) != NULL) {
+		*dot = '_';
+		++dot;
+	}
+
 	if (mapping && tgt_policy) {
 		fprintf(stderr, "Please select only one mode between --mapping and --tgt_policy\n");
 		usage(argv[0]);