diff --git a/dualwand.c b/dualwand.c
index df66f5b..774d35d 100644
--- a/dualwand.c
+++ b/dualwand.c
@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-void decBinary(int zahl) {
+void decBinary(unsigned int zahl) {
     if(zahl == 0){
         return;
     }