diff --git a/src/main/resources/scripts/gvm-common.sh b/src/main/resources/scripts/gvm-common.sh
index c3051208..05708c09 100644
--- a/src/main/resources/scripts/gvm-common.sh
+++ b/src/main/resources/scripts/gvm-common.sh
@@ -85,13 +85,13 @@ function __gvmtool_build_version_csv {
 
 function __gvmtool_determine_current_version {
 	CANDIDATE="$1"
-	CURRENT=$(echo $PATH | sed -E "s|.gvm/${CANDIDATE}/([^/]+)/bin|!!\1!!|1" | sed -E "s|^.*!!(.+)!!.*$|\1|g")
+	CURRENT=$(echo $PATH | sed -r "s|.gvm/${CANDIDATE}/([^/]+)/bin|!!\1!!|1" | sed -r "s|^.*!!(.+)!!.*$|\1|g")
 	if [[ "${CURRENT}" == "current" ]]; then
 	    unset CURRENT
 	fi
 
 	if [[ -z ${CURRENT} ]]; then
-		CURRENT=$(readlink "${GVM_DIR}/${CANDIDATE}/current" | sed -e "s!${GVM_DIR}/${CANDIDATE}/!!g")
+		CURRENT=$(readlink "${GVM_DIR}/${CANDIDATE}/current" | sed "s!${GVM_DIR}/${CANDIDATE}/!!g")
 	fi
 }
 
diff --git a/src/main/resources/scripts/gvm-use.sh b/src/main/resources/scripts/gvm-use.sh
index 8cf4aead..30cd1526 100644
--- a/src/main/resources/scripts/gvm-use.sh
+++ b/src/main/resources/scripts/gvm-use.sh
@@ -40,7 +40,7 @@ function __gvmtool_use {
 	export "${UPPER_CANDIDATE}_HOME"="${GVM_DIR}/${CANDIDATE}/${VERSION}"
 
 	# Replace the current path for the candidate with the selected version.
-	export PATH=`echo $PATH | sed -E "s!${GVM_DIR}/${CANDIDATE}/([^/]+)!${GVM_DIR}/${CANDIDATE}/${VERSION}!g"`
+	export PATH=`echo $PATH | sed -r "s!${GVM_DIR}/${CANDIDATE}/([^/]+)!${GVM_DIR}/${CANDIDATE}/${VERSION}!g"`
 
 	echo ""
 	echo Using "${CANDIDATE}" version "${VERSION} in this shell."