diff --git a/make/rules.mk b/make/rules.mk
index dd38b1ac..696a49ec 100644
--- a/make/rules.mk
+++ b/make/rules.mk
@@ -118,8 +118,8 @@ $(INSTALL_DOCDIR_DIST)/% $(INSTALL_DOCDIR_DEVEL)/%: %
 	$(INSTALL) -o $(HDROWNER) -g $(HDRGROUP) -m $(HDRMODE) $< $@
 	
 $(INSTALLED_PROFILE_PATH_SCRIPT):
-	echo "if [ -z $$PATH ]; then PATH=$(shell echo $(INSTALL_BINDIR) | sed -e s%$(ENV_PREFIX)%%)" > path_script.sh
-	echo "else PATH=$$PATH:$(shell echo $(INSTALL_BINDIR) | sed -e s%$(ENV_PREFIX)%%); fi" >> path_script.sh
+	echo "if [ -z \"\$$PATH\" ]; then PATH=$(shell echo $(INSTALL_BINDIR) | sed -e s%^$(ENV_PREFIX)/%/%)" > path_script.sh
+	echo "else PATH=\$$PATH:$(shell echo $(INSTALL_BINDIR) | sed -e s%^$(ENV_PREFIX)/%/%); fi" >> path_script.sh
 	mkdir -p $(dir $@)
 	$(INSTALL) -o $(MAKEOWNER) -g $(MAKEGROUP) -m $(MAKEMODE) path_script.sh $@