diff --git a/builtin/rebase.c b/builtin/rebase.c
index b5c99ec10c..58607a2019 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -653,7 +653,7 @@ static int rebase_config(const char *var, const char *value, void *data)
 		if (git_config_bool(var, value))
 			opts->flags |= REBASE_DIFFSTAT;
 		else
-			opts->flags &= !REBASE_DIFFSTAT;
+			opts->flags &= ~REBASE_DIFFSTAT;
 		return 0;
 	}