diff --git a/npa/src/npa-tool.c b/npa/src/npa-tool.c
index 15ffb5e..3e48c25 100644
--- a/npa/src/npa-tool.c
+++ b/npa/src/npa-tool.c
@@ -54,7 +54,7 @@ static ssize_t getline(char **lineptr, size_t *n, FILE *stream)
 
 int fread_to_eof(const char *file, unsigned char **buf, size_t *buflen)
 {
-    FILE *input;
+    FILE *input = NULL;
     int r = 0;
     unsigned char *p;