diff --git a/src/assert.cpp b/src/assert.cpp
index 7f8c67d31..80a491247 100644
--- a/src/assert.cpp
+++ b/src/assert.cpp
@@ -114,7 +114,7 @@ void print_backtrace(char* out, int len)
 }
 #else
 
-void print_backtrace(FILE* out, char const* label) {}
+void print_backtrace(char* out, int len) {}
 
 #endif