diff --git a/libc/bionic/malloc_debug_common.cpp b/libc/bionic/malloc_debug_common.cpp
index bba0472e3..6e1ee70dd 100644
--- a/libc/bionic/malloc_debug_common.cpp
+++ b/libc/bionic/malloc_debug_common.cpp
@@ -376,6 +376,11 @@ static void malloc_init_impl() {
         }
     }
 
+    // mksh is way too leaky. http://b/7291287.
+    if (debug_level >= 10 && strcmp(__progname, "sh") == 0) {
+        return;
+    }
+
     // Choose the appropriate .so for the requested debug level.
     switch (debug_level) {
         case 1: