diff --git a/pkg/monocypher/Makefile b/pkg/monocypher/Makefile
index 90e7b7d925..a9b0657b3a 100644
--- a/pkg/monocypher/Makefile
+++ b/pkg/monocypher/Makefile
@@ -5,6 +5,8 @@ PKG_LICENSE=CC-0
 
 include $(RIOTBASE)/pkg/pkg.mk
 
+CFLAGS += -DBLAKE2_NO_UNROLLING
+
 all: $(filter monocypher_optional,$(USEMODULE))
 	"$(MAKE)" -C $(PKG_BUILDDIR)/src -f $(RIOTBASE)/Makefile.base MODULE=$(PKG_NAME)
 
diff --git a/pkg/monocypher/Makefile.include b/pkg/monocypher/Makefile.include
index faa98bf5c1..67916ad9c7 100644
--- a/pkg/monocypher/Makefile.include
+++ b/pkg/monocypher/Makefile.include
@@ -1,4 +1,2 @@
 INCLUDES += -I$(PKGDIRBASE)/monocypher/src
 INCLUDES += -I$(PKGDIRBASE)/monocypher/src/optional
-
-CFLAGS += -DBLAKE2_NO_UNROLLING