diff --git a/src/asn1Decoding.c b/src/asn1Decoding.c
index 098ab9e..d1f3723 100644
--- a/src/asn1Decoding.c
+++ b/src/asn1Decoding.c
@@ -193,7 +193,7 @@ main (int argc, char *argv[])
 
 
   {
-    size_t tmplen;
+    size_t tmplen = 0;
     der = (unsigned char *) read_file (inputFileDerName, RF_BINARY, &tmplen);
     der_len = tmplen;
   }