diff --git a/mk/main.mk b/mk/main.mk
index 20323adaea1..60f5114f0ae 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -22,7 +22,7 @@ CFG_PRERELEASE_VERSION=.1
 
 # Append a version-dependent hash to each library, so we can install different
 # versions in the same place
-CFG_FILENAME_EXTRA=$(shell echo -n $(CFG_RELEASE) | $(CFG_HASH_COMMAND))
+CFG_FILENAME_EXTRA=$(shell printf '%s' $(CFG_RELEASE) | $(CFG_HASH_COMMAND))
 
 ifeq ($(CFG_RELEASE_CHANNEL),stable)
 # This is the normal semver version string, e.g. "0.12.0", "0.12.0-nightly"