diff --git a/platform/x11/detect.py b/platform/x11/detect.py
index 03de91fa2fb..1c8d231d4a1 100644
--- a/platform/x11/detect.py
+++ b/platform/x11/detect.py
@@ -123,7 +123,7 @@ def configure(env):
 	if (is64 and env["bits"]=="32"):
 		env.Append(CPPFLAGS=['-m32'])
 		env.Append(LINKFLAGS=['-m32','-L/usr/lib/i386-linux-gnu'])
-	elif (not is64 and env["bits"]=="32"):
+	elif (not is64 and env["bits"]=="64"):
 		env.Append(CPPFLAGS=['-m64'])
 		env.Append(LINKFLAGS=['-m64','-L/usr/lib/i686-linux-gnu'])