--- a/third/slash/slash/src/env.cc
+++ b/third/slash/slash/src/env.cc
@@ -348,7 +348,7 @@
 
   virtual Status Read(size_t n, Slice* result, char* scratch) override {
     Status s;
-    size_t r = fread_unlocked(scratch, 1, n, file_);
+    size_t r = fread(scratch, 1, n, file_);
 
     *result = Slice(scratch, r);