diff --git a/include/json_print.h b/include/json_print.h
index 78a6c83f..218da31a 100644
--- a/include/json_print.h
+++ b/include/json_print.h
@@ -66,7 +66,7 @@ _PRINT_FUNC(uint, unsigned int);
 _PRINT_FUNC(u64, uint64_t);
 _PRINT_FUNC(hu, unsigned short);
 _PRINT_FUNC(hex, unsigned int);
-_PRINT_FUNC(0xhex, unsigned int);
+_PRINT_FUNC(0xhex, unsigned long long int);
 _PRINT_FUNC(luint, unsigned long int);
 _PRINT_FUNC(lluint, unsigned long long int);
 _PRINT_FUNC(float, double);
diff --git a/lib/json_print.c b/lib/json_print.c
index eed109c5..f7ef41c1 100644
--- a/lib/json_print.c
+++ b/lib/json_print.c
@@ -172,12 +172,12 @@ void print_color_0xhex(enum output_type type,
 		       enum color_attr color,
 		       const char *key,
 		       const char *fmt,
-		       unsigned int hex)
+		       unsigned long long hex)
 {
 	if (_IS_JSON_CONTEXT(type)) {
 		SPRINT_BUF(b1);
 
-		snprintf(b1, sizeof(b1), "%#x", hex);
+		snprintf(b1, sizeof(b1), "%#llx", hex);
 		print_string(PRINT_JSON, key, NULL, b1);
 	} else if (_IS_FP_CONTEXT(type)) {
 		color_fprintf(stdout, color, fmt, hex);