diff --git a/repos/libports/lib/mk/libsparkcrypto.inc b/repos/libports/lib/mk/libsparkcrypto.inc
index 0e4ad467ec..336e909f31 100644
--- a/repos/libports/lib/mk/libsparkcrypto.inc
+++ b/repos/libports/lib/mk/libsparkcrypto.inc
@@ -77,4 +77,4 @@ vpath %.adb $(LSC_DIR)/shared/generic
 vpath %.ads $(LSC_DIR)/shared/generic
 
 SHARED_LIB = yes
-CUSTOM_ADA_OPT += -gnatec=$(LSC_DIR)/../build/pragmas.adc -fPIC
+CC_ADA_OPT += -gnatec=$(LSC_DIR)/../build/pragmas.adc -fPIC