diff --git a/conf/intel/portage/env/O3.amd64.conf b/conf/intel/portage/env/O3.amd64.conf
index fae6b3b..33a5948 100644
--- a/conf/intel/portage/env/O3.amd64.conf
+++ b/conf/intel/portage/env/O3.amd64.conf
@@ -1,3 +1,4 @@
 # Set -O3 for perf. critical packages
+FEATURES="test splitdebug"
 CFLAGS="-O3 -march=x86-64 -pipe"
 CXXFLAGS="${CFLAGS}"
diff --git a/conf/intel/portage/env/O3.x86.conf b/conf/intel/portage/env/O3.x86.conf
index 2cb87eb..e921449 100644
--- a/conf/intel/portage/env/O3.x86.conf
+++ b/conf/intel/portage/env/O3.x86.conf
@@ -1,3 +1,4 @@
 # Set -O3 for perf. critical packages
+FEATURES="test splitdebug"
 CFLAGS="-O3 -march=i686 -pipe"
 CXXFLAGS="${CFLAGS}"