diff --git a/cper-utils.h b/cper-utils.h
index fef58e6..a0d0af9 100644
--- a/cper-utils.h
+++ b/cper-utils.h
@@ -7,7 +7,7 @@
 json_object* cper_generic_error_status_to_ir(EFI_GENERIC_ERROR_STATUS* error_status);
 json_object* uniform_struct_to_ir(UINT32* start, int len, const char* names[]);
 json_object* uniform_struct64_to_ir(UINT64* start, int len, const char* names[]);
-json_object* integer_to_readable_pair(int value, int len, int keys[], const char* values[], const char* default_value);
+json_object* integer_to_readable_pair(UINT64 value, int len, int keys[], const char* values[], const char* default_value);
 json_object* integer_to_readable_pair_with_desc(int value, int len, int keys[], const char* values[], const char* descriptions[], const char* default_value);
 json_object* bitfield_to_ir(UINT64 bitfield, int num_fields, const char* names[]);
 json_object* uint64_array_to_ir_array(UINT64* array, int len);