diff --git a/configure/E3/CONFIG_REQUIRE b/configure/E3/CONFIG_REQUIRE
index 1a689389cc3cc0095cbe94e78b5e0a4269a3f478..045f42b54ef166f16c597e6cd6a34b3af31a235c 100644
--- a/configure/E3/CONFIG_REQUIRE
+++ b/configure/E3/CONFIG_REQUIRE
@@ -2,7 +2,7 @@
 # The following VARIABLES are the same as other modules ones.
 #
 
-E3_REQUIRE_LOCATION?=$(EPICS_BASE)/$(E3_REQUIRE_NAME)/$(E3_REQUIRE_VERSION)
+E3_REQUIRE_LOCATION:=$(EPICS_BASE)/$(E3_REQUIRE_NAME)/$(E3_REQUIRE_VERSION)
 
 E3_REQUIRE_TOOLS:=$(E3_REQUIRE_LOCATION)/tools
 E3_REQUIRE_BIN:=$(E3_REQUIRE_LOCATION)/bin
diff --git a/configure/modules/CONFIG_REQUIRE b/configure/modules/CONFIG_REQUIRE
index 1a689389cc3cc0095cbe94e78b5e0a4269a3f478..045f42b54ef166f16c597e6cd6a34b3af31a235c 100644
--- a/configure/modules/CONFIG_REQUIRE
+++ b/configure/modules/CONFIG_REQUIRE
@@ -2,7 +2,7 @@
 # The following VARIABLES are the same as other modules ones.
 #
 
-E3_REQUIRE_LOCATION?=$(EPICS_BASE)/$(E3_REQUIRE_NAME)/$(E3_REQUIRE_VERSION)
+E3_REQUIRE_LOCATION:=$(EPICS_BASE)/$(E3_REQUIRE_NAME)/$(E3_REQUIRE_VERSION)
 
 E3_REQUIRE_TOOLS:=$(E3_REQUIRE_LOCATION)/tools
 E3_REQUIRE_BIN:=$(E3_REQUIRE_LOCATION)/bin