diff --git a/Makefile b/Makefile
index fb80529..3f62b66 100644
--- a/Makefile
+++ b/Makefile
@@ -197,6 +197,7 @@
 	3rdparty/*/*.c 3rdparty/*/*/*.c 3rdparty/*/*/*/*.c 3rdparty/*/*/*/*/*.c \
 	include/*/*.h \
 	library/*.[hc] \
+	tf-psa-crypto/include/*/*.h \
 	programs/*/*.[hc] \
 	tests/include/*/*.h tests/include/*/*/*.h \
 	tests/src/*.c tests/src/*/*.c \
@@ -213,5 +214,5 @@
 	ls $(C_SOURCE_FILES) | gtags -f - --gtagsconf .globalrc
 cscope: cscope.in.out cscope.po.out cscope.out
 cscope.in.out cscope.po.out cscope.out: $(C_SOURCE_FILES)
-	cscope -bq -u -Iinclude -Ilibrary $(patsubst %,-I%,$(wildcard 3rdparty/*/include)) -Itests/include $(C_SOURCE_FILES)
+	cscope -bq -u -Iinclude -Ilibrary -Itf-psa-crypto/include $(patsubst %,-I%,$(wildcard 3rdparty/*/include)) -Itests/include $(C_SOURCE_FILES)
 .PHONY: cscope global