diff --git a/repos/base-nova/Makefile b/repos/base-nova/Makefile
index 59dc28b868..7cf1245b7f 100644
--- a/repos/base-nova/Makefile
+++ b/repos/base-nova/Makefile
@@ -14,7 +14,7 @@ ECHO    := @echo
 help::
 
 prepare:
-	$(VERBOSE)../../tool/ports/prepare_port nova
+	$(VERBOSE)../../tool/ports/prepare_port nova CHECK_HASH=no
 
 help::
 	$(ECHO)
diff --git a/repos/base-okl4/Makefile b/repos/base-okl4/Makefile
index cc228bc33c..f23d857f13 100644
--- a/repos/base-okl4/Makefile
+++ b/repos/base-okl4/Makefile
@@ -18,6 +18,6 @@ help:
 	$(ECHO)
 
 prepare:
-	$(VERBOSE)../../tool/ports/prepare_port okl4
+	$(VERBOSE)../../tool/ports/prepare_port okl4 CHECK_HASH=no
 
 clean cleanall:
diff --git a/repos/dde_oss/Makefile b/repos/dde_oss/Makefile
index 6a229c5522..d13b4e8da0 100644
--- a/repos/dde_oss/Makefile
+++ b/repos/dde_oss/Makefile
@@ -19,4 +19,4 @@ help:
 	$(ECHO)
 
 prepare:
-	$(VERBOSE)../../tool/ports/prepare_port oss
+	$(VERBOSE)../../tool/ports/prepare_port oss CHECK_HASH=no
diff --git a/tool/prepare.mk b/tool/prepare.mk
index 7c24bd4592..7ff41e6877 100644
--- a/tool/prepare.mk
+++ b/tool/prepare.mk
@@ -33,7 +33,7 @@ NEW_PORTS := $(patsubst %.port,%,$(notdir $(wildcard ports/*.port)))
 
 # generic rule for invoking the new tool/ports/prepare_port mechanism
 $(addprefix prepare-,$(NEW_PORTS)):
-	$(VERBOSE)../../tool/ports/prepare_port $(patsubst prepare-%,%,$@)
+	$(VERBOSE)../../tool/ports/prepare_port $(patsubst prepare-%,%,$@) CHECK_HASH=no
 
 #
 # Create download and contrib directory so that '<port>.mk' files