diff --git a/tools/browsertime/mach_commands.py b/tools/browsertime/mach_commands.py
index f2f8379b864da..f3bc59234b729 100644
--- a/tools/browsertime/mach_commands.py
+++ b/tools/browsertime/mach_commands.py
@@ -273,12 +273,18 @@ def append_env(self, append_path=True):
         node_dir = os.path.dirname(self.node_path)
         path = [node_dir] + path
 
-        
-        
-        path = [os.path.dirname(self.virtualenv_manager.python_path)] + path
-
         append_env = {
             'PATH': os.pathsep.join(path),
+
+            
+            
+            
+            
+            
+            
+            
+            
+            'PYTHON': self.virtualenv_manager.python_path,
         }
 
         if path_to_imagemagick: