diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile
index 42ea7d2aa844008b54f80a6e61cdef39a3a233ca..d7b312b44a62a8540bdb5f6c0e105010315de2f9 100644
--- a/tools/testing/selftests/gpio/Makefile
+++ b/tools/testing/selftests/gpio/Makefile
@@ -3,6 +3,6 @@
 TEST_PROGS := gpio-mockup.sh
 TEST_FILES := gpio-mockup-sysfs.sh
 TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev
-CFLAGS += -I../../../../usr/include
+CFLAGS += -O2 -g -Wall -I../../../../usr/include/
 
 include ../lib.mk