diff --git a/example.c b/example.c
index 5c4b8ac..9c80821 100644
--- a/example.c
+++ b/example.c
@@ -241,7 +241,10 @@ static uint8_t *load_file(const char *filename, int *plen)
     buf_len = ftell(f);
     fseek(f, 0, SEEK_SET);
     buf = malloc(buf_len + 1);
-    fread(buf, 1, buf_len, f);
+    if (fread(buf, 1, buf_len, f) != buf_len) {
+        printf("not read %d bytes\n", buf_len);
+        exit(1);
+    }
     buf[buf_len] = '\0';
     fclose(f);
     if (plen)
diff --git a/mqjs.c b/mqjs.c
index 75a8c03..aa18f4d 100644
--- a/mqjs.c
+++ b/mqjs.c
@@ -250,7 +250,10 @@ static uint8_t *load_file(const char *filename, int *plen)
     buf_len = ftell(f);
     fseek(f, 0, SEEK_SET);
     buf = malloc(buf_len + 1);
-    fread(buf, 1, buf_len, f);
+    if (fread(buf, 1, buf_len, f) != buf_len) {
+        printf("not read %d bytes\n", buf_len);
+        exit(1);
+    }
     buf[buf_len] = '\0';
     fclose(f);
     if (plen)