diff --git a/wmake/rules/linux64Gcc/c++Opt b/wmake/rules/linux64Gcc/c++Opt
index 3363be8090..a0fae531b8 100644
--- a/wmake/rules/linux64Gcc/c++Opt
+++ b/wmake/rules/linux64Gcc/c++Opt
@@ -1,3 +1,3 @@
-#c++DBUG     = -O0 -DFULLDEBUG -g
 c++DBUG     =
 c++OPT      = -O3
+# -fprefetch-loop-arrays
diff --git a/wmake/rules/linux64Gcc/cOpt b/wmake/rules/linux64Gcc/cOpt
index 17318709f1..980f0ea46a 100644
--- a/wmake/rules/linux64Gcc/cOpt
+++ b/wmake/rules/linux64Gcc/cOpt
@@ -1,2 +1,3 @@
 cDBUG       =
 cOPT        = -O3
+# -fprefetch-loop-arrays