diff --git a/ctl b/ctl
index 58f56b7..eb545ca 100755
--- a/ctl
+++ b/ctl
@@ -46,7 +46,7 @@ else
         fi
         if [ $PLATFORM == "aarch64" ]; then
             ARCH="_aarch64"
-            PLATFORM_PY=3.5
+            PLATFORM_PYTHON=3.5
         fi
         if [ $PLATFORM == "armv7l" ]; then
             ARCH="_armv7l"
@@ -55,7 +55,7 @@ else
     fi
     if [ $SYSTEM == "Darwin" ]; then
         PLATFORM="darwin64"
-        PLATFORM_PY=3.5
+        PLATFORM_PYTHON=3.5
     fi
     export PLATFORM_ENV="$BASE/platform_${PLATFORM}"
 fi