diff --git a/gpaw.spec b/gpaw.spec
index 4eec05d..5e1f778 100644
--- a/gpaw.spec
+++ b/gpaw.spec
@@ -208,10 +208,11 @@ find python3/tools -type f | xargs sed -i '1s|^#!/usr/bin/env python.*|#!/usr/bi
 
 
 %build
+%set_build_flags
 
 # To avoid replicated code define a macro
 %global dobuild() \
-CFLAGS="$RPM_OPT_FLAGS" ${PYTHON} setup.py build && \
+${PYTHON} setup.py build && \
 mv build build$MPI_SUFFIX && \
 ${PYTHON} setup.py clean