diff --git a/src/runtime/lean.h b/src/runtime/lean.h
index 5f5e6b8172..937c3a7c33 100644
--- a/src/runtime/lean.h
+++ b/src/runtime/lean.h
@@ -34,7 +34,7 @@ extern "C" {
 #define LEAN_ALWAYS_INLINE
 #endif
 
- #define LEAN_BYTE(Var, Index) *(((uint8_t*)&Var)+Index)
+#define LEAN_BYTE(Var, Index) *(((uint8_t*)&Var)+Index)
 
 #define LeanMaxCtorTag  245
 #define LeanClosure     246