diff --git a/.gitcommit b/.gitcommit
index 46b7856fb..6828f88dc 100644
--- a/.gitcommit
+++ b/.gitcommit
@@ -1 +1 @@
-$Format:%h$
+$Format:%H$
diff --git a/Makefile b/Makefile
index 96c133da9..25a039256 100644
--- a/Makefile
+++ b/Makefile
@@ -150,7 +150,7 @@ YOSYS_VER := 0.43+3
 # will have this file in its unexpanded form tough, in which case we fall
 # back to calling git directly.
 TARBALL_GIT_REV := $(shell cat $(YOSYS_SRC)/.gitcommit)
-ifeq ($(TARBALL_GIT_REV),$$Format:%h$$)
+ifneq ($(findstring "Format:",$(TARBALL_GIT_REV)),)
 GIT_REV := $(shell GIT_DIR=$(YOSYS_SRC)/.git git rev-parse --short=9 HEAD || echo UNKNOWN)
 else
 GIT_REV := $(TARBALL_GIT_REV)
@@ -773,10 +773,10 @@ check-git-abc:
 		exit 1; \
 	elif git -C "$(YOSYS_SRC)" submodule status abc 2>/dev/null | grep -q '^ '; then \
 		exit 0; \
-	elif [ -f "$(YOSYS_SRC)/abc/.gitcommit" ] && ! grep -q '\$$Format:%h\$$' "$(YOSYS_SRC)/abc/.gitcommit"; then \
+	elif [ -f "$(YOSYS_SRC)/abc/.gitcommit" ] && ! grep -q '\$$Format:%[hH]\$$' "$(YOSYS_SRC)/abc/.gitcommit"; then \
 		echo "'abc' comes from a tarball. Continuing."; \
 		exit 0; \
-	elif [ -f "$(YOSYS_SRC)/abc/.gitcommit" ] && grep -q '\$$Format:%h\$$' "$(YOSYS_SRC)/abc/.gitcommit"; then \
+	elif [ -f "$(YOSYS_SRC)/abc/.gitcommit" ] && grep -q '\$$Format:%[hH]\$$' "$(YOSYS_SRC)/abc/.gitcommit"; then \
 		echo "Error: 'abc' is not configured as a git submodule."; \
 		echo "To resolve this:"; \
 		echo "1. Back up your changes: Save any modifications from the 'abc' directory to another location."; \