diff --git a/reinstall-esp-idf.sh b/reinstall-esp-idf.sh
index 5833a2e..37d492c 100644
--- a/reinstall-esp-idf.sh
+++ b/reinstall-esp-idf.sh
@@ -255,7 +255,7 @@ function handleAliasEnviron() {
 
 	if [ -z $ESPIDF_INSTALLDIR ]; then
 		writeToLog "ESPIDF_INSTALLDIR environment variable not found, appending to $rcFile"
-		echo -e "Export ESPIDF_INSTALLDIR=\"$installDir\"\n" >> $rcFile
+		echo -e "export ESPIDF_INSTALLDIR=\"$installDir\"\n" >> $rcFile
 		returnStatus
 		aliasInstallDirChk=$?
 	else
diff --git a/version.txt b/version.txt
index 94276b8..745b3dd 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-6-prerelease6.6.3
\ No newline at end of file
+6-prerelease6.6.4
\ No newline at end of file