diff --git a/scram-tools.file/tools/gcc/ofast-flag.xml b/scram-tools.file/tools/gcc/ofast-flag.xml
index c8ec9ec50db..b9ae0699273 100644
--- a/scram-tools.file/tools/gcc/ofast-flag.xml
+++ b/scram-tools.file/tools/gcc/ofast-flag.xml
@@ -1,5 +1,5 @@
   <tool name="ofast-flag" version="1.0">
-    <flags CXXFLAGS="-Ofast"/>
+    <flags CXXFLAGS="-Ofast -fno-reciprocal-math -mrecip=none"/>
     <ifarchitecture name="slc6_">
       <ifcompiler name="llvm">
         <flags CXXFLAGS="-fno-builtin"/>