diff --git a/build/config/linux/pkg-config.py b/build/config/linux/pkg-config.py
index ded24789504596..4d6e773a00d666 100755
--- a/build/config/linux/pkg-config.py
+++ b/build/config/linux/pkg-config.py
@@ -99,7 +99,7 @@ def GetPkgConfigPrefixToStrip(options, args):
     # from pkg-config's |prefix| variable.
     prefix = subprocess.check_output([options.pkg_config,
                                       "--variable=prefix"] + args, env=os.environ).decode('utf-8')
-    if prefix[-4] == '/usr':
+    if prefix[:4] == '/usr':
         return prefix[4:]
     return prefix