1 files changed, 1 insertions, 1 deletions
diff --git a/src/ipcalc.c b/src/ipcalc.c
index 6f1be64b..c93e8329 100644
--- a/src/ipcalc.c
+++ b/src/ipcalc.c
@@ -336,7 +336,7 @@ int main(int argc, const char **argv) {
     }
 
     /* Handle CIDR entries such as 172/8 */
-    if (prefix >= 0) {
+    if (prefix >= 0 && familyIPv4) {
         char *tmp = ipStr;
         int i;