diff --git a/Makefile b/Makefile
index 3327fe66..404c3c01 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # Calculate version
-version = $(git describe --always --tags --dirty)
+version ?= $(shell git describe --always --tags --dirty)
 
 rwildcard=$(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) $(filter $(subst *,%,$2),$d))