diff --git a/tools/gn2bp/gn_utils.py b/tools/gn2bp/gn_utils.py
index 82ff2bb..7e6752b 100644
--- a/tools/gn2bp/gn_utils.py
+++ b/tools/gn2bp/gn_utils.py
@@ -171,11 +171,19 @@
     self.proto_libs = {}
 
   def _get_response_file_contents(self, action_desc):
-    contents = ' '.join(action_desc.get('response_file_contents', []))
-    # escape both single and double quotes.
-    contents.replace('"', '\"')
-    contents.replace("'", '\'')
-    return contents
+    # response_file_contents are formatted as:
+    # ['--flags', '--flag=true && false'] and need to be formatted as:
+    # '--flags --flag=\"true && false\"'
+    flags = action_desc.get('response_file_contents', [])
+    formatted_flags = []
+    for flag in flags:
+      if '=' in flag:
+        key, val = flag.split('=')
+        formatted_flags.append('%s=\\"%s\\"' % (key, val))
+      else:
+        formatted_flags.append(flag)
+
+    return ' '.join(formatted_flags)
 
   def get_target(self, gn_target_name):
     """Returns a Target object from the fully qualified GN target name.