diff --git a/lib/misc/lejp.c b/lib/misc/lejp.c
index 50ff4b5a..5407c90f 100644
--- a/lib/misc/lejp.c
+++ b/lib/misc/lejp.c
@@ -25,7 +25,7 @@
 
 void
 lejp_construct(struct lejp_ctx *ctx,
-	char (*callback)(struct lejp_ctx *ctx, char reason), void *user,
+	signed char (*callback)(struct lejp_ctx *ctx, char reason), void *user,
 			const char * const *paths, unsigned char count_paths)
 {
 	ctx->st[0].s = 0;
@@ -86,7 +86,7 @@ lejp_destruct(struct lejp_ctx *ctx)
 
 void
 lejp_change_callback(struct lejp_ctx *ctx,
-		       char (*callback)(struct lejp_ctx *ctx, char reason))
+		     signed char (*callback)(struct lejp_ctx *ctx, char reason))
 {
 	ctx->callback(ctx, LEJPCB_DESTRUCTED);
 	ctx->callback = callback;
diff --git a/lib/misc/lejp.h b/lib/misc/lejp.h
index 7bf7ba7f..0b37bb3e 100644
--- a/lib/misc/lejp.h
+++ b/lib/misc/lejp.h
@@ -140,9 +140,9 @@ enum lejp_callbacks {
  *
  *  LEJPCB_OBJECT_END:	An object ended
  */
-LWS_EXTERN char _lejp_callback(struct lejp_ctx *ctx, char reason);
+LWS_EXTERN signed char _lejp_callback(struct lejp_ctx *ctx, char reason);
 
-typedef char (*lejp_callback)(struct lejp_ctx *ctx, char reason);
+typedef signed char (*lejp_callback)(struct lejp_ctx *ctx, char reason);
 
 #ifndef LEJP_MAX_DEPTH
 #define LEJP_MAX_DEPTH 12
@@ -179,7 +179,7 @@ struct lejp_ctx {
 	 * pointers
 	 */
 
-	char (*callback)(struct lejp_ctx *ctx, char reason);
+	signed char (*callback)(struct lejp_ctx *ctx, char reason);
 	void *user;
 	const char * const *paths;
 
@@ -215,8 +215,8 @@ struct lejp_ctx {
 
 LWS_VISIBLE LWS_EXTERN void
 lejp_construct(struct lejp_ctx *ctx,
-	       char (*callback)(struct lejp_ctx *ctx, char reason), void *user,
-	       const char * const *paths, unsigned char paths_count);
+	       signed char (*callback)(struct lejp_ctx *ctx, char reason),
+	       void *user, const char * const *paths, unsigned char paths_count);
 
 LWS_VISIBLE LWS_EXTERN void
 lejp_destruct(struct lejp_ctx *ctx);
@@ -226,7 +226,7 @@ lejp_parse(struct lejp_ctx *ctx, const unsigned char *json, int len);
 
 LWS_VISIBLE LWS_EXTERN void
 lejp_change_callback(struct lejp_ctx *ctx,
-		       char (*callback)(struct lejp_ctx *ctx, char reason));
+		     signed char (*callback)(struct lejp_ctx *ctx, char reason));
 
 LWS_VISIBLE LWS_EXTERN int
 lejp_get_wildcard(struct lejp_ctx *ctx, int wildcard, char *dest, int len);
diff --git a/lib/server/lejp-conf.c b/lib/server/lejp-conf.c
index 565e2da9..f4b894de 100644
--- a/lib/server/lejp-conf.c
+++ b/lib/server/lejp-conf.c
@@ -223,7 +223,7 @@ arg_to_bool(const char *s)
 	return 0;
 }
 
-static char
+static signed char
 lejp_globals_cb(struct lejp_ctx *ctx, char reason)
 {
 	struct jpargs *a = (struct jpargs *)ctx->user;
@@ -296,7 +296,7 @@ dostring:
 	return 0;
 }
 
-static char
+static signed char
 lejp_vhosts_cb(struct lejp_ctx *ctx, char reason)
 {
 	struct jpargs *a = (struct jpargs *)ctx->user;