diff --git a/undpu.c b/undpu.c
index 17aad6c..4c880aa 100644
--- a/undpu.c
+++ b/undpu.c
@@ -58,7 +58,7 @@ int main (int argc, char **argv){
 		}
 	}
 	if(!out){
-		strncpy(output,argv[0],strlen(argv[0])-4);
+		strlcpy(output,argv[0],strlen(argv[0])-4);
 		if((joe = fopen(output,"w"))==NULL){
 			fputs("Ummm, the output file doesn't work.\n",stderr);
 			return EXIT_FAILURE;