diff --git a/scram-tools.file/tools/gcc/gcc-cxxcompiler.xml b/scram-tools.file/tools/gcc/gcc-cxxcompiler.xml
index 44b9138cc6f..91619bd1cab 100644
--- a/scram-tools.file/tools/gcc/gcc-cxxcompiler.xml
+++ b/scram-tools.file/tools/gcc/gcc-cxxcompiler.xml
@@ -5,7 +5,7 @@
     </client>
     <flags CPPDEFINES="GNU_GCC _GNU_SOURCE @GCC_CPPDEFINES@"/>
     <flags CXXSHAREDOBJECTFLAGS="-fPIC @GCC_CXXSHAREDOBJECTFLAGS@"/>
-    <flags CXXFLAGS="-O2 -pthread -pipe -Werror=main -Werror=pointer-arith"/>
+    <flags CXXFLAGS="-O0 -pthread -pipe -Werror=main -Werror=pointer-arith"/>
     <flags CXXFLAGS="-Werror=overlength-strings -Wno-vla @GCC_CXXFLAGS@"/>
     <flags CXXFLAGS="-felide-constructors -fmessage-length=0"/>
     <flags CXXFLAGS="-Wall -Wno-non-template-friend -Wno-long-long -Wreturn-type"/>