...
diff --git a/coders/json.c b/coders/json.c
index ab32137..662138d 100644
--- a/coders/json.c
+++ b/coders/json.c
@@ -615,7 +615,7 @@
     i;
 
   ssize_t
-    n;
+    n = 0;
 
   (void) FormatLocaleFile(file,"      \"colorspaces\": [ ");
   for (i=0; i < (ssize_t) channel_phash[0].number_colorspaces; i++)