diff --git a/nvs b/nvs
index e2d2f31a..4f77da1f 100755
--- a/nvs
+++ b/nvs
@@ -8,7 +8,9 @@
 
 # Enable the nvsudo() shell function to modify the PATH of the sudo environment.
 if [ -n "${NVS_CURRENT}" ]; then
-	export PATH="${NVS_CURRENT}:$PATH"
+	if [[ ! "$PATH" == *"${NVS_CURRENT}:"* ]]; then
+		export PATH="${NVS_CURRENT}:$PATH"
+	fi
 fi
 
 export NVS_EXECUTE=1
diff --git a/nvs.sh b/nvs.sh
index b24763a1..45cef3be 100644
--- a/nvs.sh
+++ b/nvs.sh
@@ -226,10 +226,14 @@ fi
 # If some version is linked as the default, begin by using that version.
 if [ -d "${NVS_HOME}/default" ]; then
 	if [ -f "${NVS_HOME}/default/bin/node" ]; then
-		export PATH="${NVS_HOME}/default/bin:${PATH}"
+		if [[ ! "$PATH" == *"${NVS_HOME}/default/bin"* ]]; then
+			export PATH="${NVS_HOME}/default/bin:${PATH}"
+		fi
 		unset NPM_CONFIG_PREFIX
 	elif [ -f "${NVS_HOME}/default/node" ]; then
-		export PATH="${NVS_HOME}/default:${PATH}"
+		if [[ ! "$PATH" == *"${NVS_HOME}/default/bin"* ]]; then
+			export PATH="${NVS_HOME}/default:${PATH}"
+		fi
 		unset NPM_CONFIG_PREFIX
 	fi
 fi