diff --git a/lib11sht.c b/lib11sht.c
index 1e26ee5..1f37528 100644
--- a/lib11sht.c
+++ b/lib11sht.c
@@ -134,7 +134,7 @@ static int uselesschar(int c)
 /* remove leading/trailing whitespace + collapse internal multiple whitespace */
 static void trim(char *s)
 {
-    int len, i, j, fin;
+    int len, i, j, fin = 0;
 
     if(!s)
         return;