diff --git a/nimble/Tuprules.tup b/nimble/Tuprules.tup
index ca9248a..73e22f3 100644
--- a/nimble/Tuprules.tup
+++ b/nimble/Tuprules.tup
@@ -1,4 +1,7 @@
-!nim_to_depot = |> nim cpp --os:genode -d:posix -o:%o %f \
+# Drop the relase flag with the line "NIM_RELEASE_FLAG="
+NIM_RELEASE_FLAG = -d:release 
+
+!nim_to_depot = |> nim cpp $(NIM_RELEASE_FLAG) --os:genode -d:posix -o:%o %f \
 	|> $(DEPOT_DIR)/bin/x86_64/%d/@(DEPOT_VERSION)/%B
 
 NIMBLE_BINARIES_INCLUDE = $(TUP_CWD)/binaries.tup