diff --git a/Makefile.am b/Makefile.am
index f7b597a..93699dd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -187,9 +187,11 @@ CLEANFILES += $(SOURCES) $(trexio_f) $(trexio_h)
 
 BUILT_SOURCES += $(SOURCES) $(trexio_f) $(test_trexio_f)
 
-.git_hash:
+.git_hash: FORCE
 	git log | head -1 | cut -d ' ' -f 2 > .git_hash
 
+all: .git_hash
+
 
 $(SOURCES): $(trexio_f)
 src/trexio.c: $(trexio_h)
@@ -260,3 +262,4 @@ CLEANFILES += $(pytrexio_c) \
 
 endif
 
+.PHONY: FORCE