diff --git a/closed/OpenJ9.gmk b/closed/OpenJ9.gmk
index 27dcc77dd3..163077bb7d 100644
--- a/closed/OpenJ9.gmk
+++ b/closed/OpenJ9.gmk
@@ -30,20 +30,20 @@ ifeq (,$(BUILD_ID))
   BUILD_ID := 000000
 endif
 
-OPENJDK_SHA := $(shell git -C $(TOPDIR) rev-parse --short HEAD)
+OPENJDK_SHA := @OPENJDK_SHA@
 ifeq (,$(OPENJDK_SHA))
   $(error Could not determine OpenJDK SHA)
 endif
 
-OPENJ9_SHA := $(shell git -C $(OPENJ9_TOPDIR) rev-parse --short HEAD)
+OPENJ9_SHA := @OPENJ9_SHA@
 ifeq (,$(OPENJ9_SHA))
   $(error Could not determine OpenJ9 SHA)
 endif
 
 # Find OpenJ9 tag associated with current commit (suppressing stderr in case there is no such tag).
-OPENJ9_TAG := $(shell git -C $(OPENJ9_TOPDIR) describe --exact-match HEAD 2>/dev/null)
+OPENJ9_TAG := @OPENJ9_TAG@
 ifeq (,$(OPENJ9_TAG))
-  OPENJ9_BRANCH := $(shell git -C $(OPENJ9_TOPDIR) rev-parse --abbrev-ref HEAD)
+  OPENJ9_BRANCH := @OPENJ9_BRANCH@
   ifeq (,$(OPENJ9_BRANCH))
     $(error Could not determine OpenJ9 branch)
   endif
@@ -52,7 +52,7 @@ else
   OPENJ9_VERSION_STRING := $(OPENJ9_TAG)
 endif
 
-OPENJ9OMR_SHA := $(shell git -C $(OPENJ9OMR_TOPDIR) rev-parse --short HEAD)
+OPENJ9OMR_SHA := @OPENJ9OMR_SHA@
 ifeq (,$(OPENJ9OMR_SHA))
   $(error Could not determine OMR SHA)
 endif
diff --git a/closed/make/Main.gmk b/closed/make/Main.gmk
index ab2310f3b0..1c7386d939 100644
--- a/closed/make/Main.gmk
+++ b/closed/make/Main.gmk
@@ -35,9 +35,9 @@ clean-j9vm :
 # Override definition from MakeBase.gmk for OpenJ9.
 define GetSourceTips
 	$(PRINTF) "%s:%s\n" \
-		OpenJDK "$(shell git -C $(TOPDIR) rev-parse --short HEAD)" \
-		OpenJ9  "$(shell git -C $(OPENJ9_TOPDIR) rev-parse --short HEAD)" \
-		OMR     "$(shell git -C $(OPENJ9OMR_TOPDIR) rev-parse --short HEAD)" \
+		OpenJDK "@OPENJDK_SHA@" \
+		OpenJ9  "@OPENJ9_SHA@" \
+		OMR     "@OPENJ9OMR_SHA@" \
 		> $@
 endef