diff --git a/utils/lit/lit/LitConfig.py b/utils/lit/lit/LitConfig.py
index 98ca2f04730..9b62470902b 100644
--- a/utils/lit/lit/LitConfig.py
+++ b/utils/lit/lit/LitConfig.py
@@ -47,6 +47,9 @@ class LitConfig:
             if self.valgrindLeakCheck:
                 self.valgrindTriple += "_leak"
                 self.valgrindArgs.append('--leak-check=full')
+            else:
+                # The default is 'summary'.
+                self.valgrindArgs.append('--leak-check=no')
             self.valgrindArgs.extend(self.valgrindUserArgs)