diff --git a/tools/qfcc/include/diagnostic.h b/tools/qfcc/include/diagnostic.h
index 6c28ccd41..1c0ee51bc 100644
--- a/tools/qfcc/include/diagnostic.h
+++ b/tools/qfcc/include/diagnostic.h
@@ -47,8 +47,10 @@ extern diagnostic_hook notice_hook;
 struct expr_s *error (struct expr_s *e, const char *fmt, ...)
 	__attribute__ ((format (printf, 2, 3)));
 void
-internal_error (struct expr_s *e, const char *fmt, ...)
-	__attribute__ ((format (printf, 2, 3), noreturn));
+_internal_error (struct expr_s *e, const char *file, int line,
+				 const char *fmt, ...)
+	__attribute__ ((format (printf, 4, 5), noreturn));
+#define internal_error(e, fmt...) _internal_error(e, __FILE__, __LINE__, fmt)
 struct expr_s *warning (struct expr_s *e, const char *fmt, ...)
 	__attribute__ ((format (printf, 2, 3)));
 struct expr_s *notice (struct expr_s *e, const char *fmt, ...)
diff --git a/tools/qfcc/source/diagnostic.c b/tools/qfcc/source/diagnostic.c
index e2511a837..dbf71142c 100644
--- a/tools/qfcc/source/diagnostic.c
+++ b/tools/qfcc/source/diagnostic.c
@@ -200,7 +200,7 @@ warning (expr_t *e, const char *fmt, ...)
 }
 
 void
-internal_error (expr_t *e, const char *fmt, ...)
+_internal_error (expr_t *e, const char *file, int line, const char *fmt, ...)
 {
 	va_list     args;
 
@@ -211,6 +211,7 @@ internal_error (expr_t *e, const char *fmt, ...)
 		dstring_t  *message = dstring_new ();
 
 		format_message (message, "internal error", e, fmt, args);
+		dasprintf (message, " (%s:%d)", file, line);
 		fprintf (stderr, "%s\n", message->str);
 		dstring_delete (message);
 	}