diff --git a/nvm.sh b/nvm.sh
index 7f7ddf2..51f9a64 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -1232,27 +1232,27 @@ nvm_install_node_source() {
     MAKE_CXX="CXX=c++"
   fi
 
-  if [ -z "$MAKE_JOBS" ]; then
+  if [ -z "$NVM_MAKE_JOBS" ]; then
     if [ "_$NVM_OS" = "_linux" ]; then
-      CPU_THREADS="$(grep -c 'core id' /proc/cpuinfo)"
+      NVM_CPU_THREADS="$(grep -c 'core id' /proc/cpuinfo)"
     elif [ "_$NVM_OS" = "_freebsd" ] || [ "_$NVM_OS" = "_darwin" ]; then
-      CPU_THREADS="$(sysctl -n hw.ncpu)"
+      NVM_CPU_THREADS="$(sysctl -n hw.ncpu)"
     elif [ "_$NVM_OS" = "_sunos" ]; then
-      CPU_THREADS="$(psrinfo | wc -l)"
+      NVM_CPU_THREADS="$(psrinfo | wc -l)"
     fi
-    local CPU_THREAD_VALID
-    CPU_THREAD_VALID=$(nvm_is_natural_num $CPU_THREADS)
-    if [ -z "$CPU_THREADS" ] || [ "$CPU_THREAD_VALID" != "true" ] ; then
+    local NVM_CPU_THREAD_VALID
+    NVM_CPU_THREAD_VALID=$(nvm_is_natural_num $NVM_CPU_THREADS)
+    if [ -z "$NVM_CPU_THREADS" ] || [ "$NVM_CPU_THREAD_VALID" != "true" ] ; then
       echo "Can not determine how many thread(s) we can use, set to only 1 now." 1>&2
       echo "Please report an issue on GitHub to help us make it better and run it faster on your computer!" 1>&2
-      MAKE_JOBS="1"
+      NVM_MAKE_JOBS="1"
     else
-      echo "Detected that you have $CPU_THREADS CPU thread(s)"
-      if [ $CPU_THREADS -gt 2 ]; then
-        MAKE_JOBS=$(($CPU_THREADS - 1))
-        echo "Set the number of jobs to $CPU_THREADS - 1 = $MAKE_JOBS jobs to speed up the build"
+      echo "Detected that you have $NVM_CPU_THREADS CPU thread(s)"
+      if [ $NVM_CPU_THREADS -gt 2 ]; then
+        NVM_MAKE_JOBS=$(($NVM_CPU_THREADS - 1))
+        echo "Set the number of jobs to $NVM_CPU_THREADS - 1 = $NVM_MAKE_JOBS jobs to speed up the build"
       else
-        MAKE_JOBS=1
+        NVM_MAKE_JOBS=1
         echo "Number of CPU thread(s) less or equal to 2 will have only one job a time for 'make'"
       fi
     fi
@@ -1278,9 +1278,9 @@ nvm_install_node_source() {
     command tar -xzf "$tmptarball" -C "$tmpdir" && \
     cd "$tmpdir/node-$VERSION" && \
     ./configure --prefix="$VERSION_PATH" $ADDITIONAL_PARAMETERS && \
-    $make -j $MAKE_JOBS $MAKE_CXX && \
+    $make -j $NVM_MAKE_JOBS $MAKE_CXX && \
     command rm -f "$VERSION_PATH" 2>/dev/null && \
-    $make -j $MAKE_JOBS $MAKE_CXX install
+    $make -j $NVM_MAKE_JOBS $MAKE_CXX install
     )
   then
     if ! nvm_has "npm" ; then
@@ -1583,18 +1583,18 @@ nvm() {
         shift
         if [ "_$1" = "_-j" ]; then
           shift
-          local CPU_THREAD_VALID
-          CPU_THREAD_VALID=$(nvm_is_natural_num $1)
-          if [ "$CPU_THREAD_VALID" = "true" ]; then
-            MAKE_JOBS=$1
+          local NVM_CPU_THREAD_VALID
+          NVM_CPU_THREAD_VALID=$(nvm_is_natural_num $1)
+          if [ "$NVM_CPU_THREAD_VALID" = "true" ]; then
+            NVM_MAKE_JOBS=$1
             echo "Set number of jobs to $MAKE_JOBS for 'make' utility"
           else
-            unset MAKE_JOBS
+            unset NVM_MAKE_JOBS
             echo >&2 "$1 is invalid for CPU threads, should be a natural number"
           fi
           shift
         else
-          unset MAKE_JOBS
+          unset NVM_MAKE_JOBS
         fi
       fi