diff --git a/windows/utils/winutils.py b/windows/utils/winutils.py
index f7ffee3..7121702 100644
--- a/windows/utils/winutils.py
+++ b/windows/utils/winutils.py
@@ -291,7 +291,7 @@ IMAGE_FILE_MACHINE_TO_PROC_ARCH = {
     gdef.IMAGE_FILE_MACHINE_I386: gdef.PROCESSOR_ARCHITECTURE_INTEL,
     gdef.IMAGE_FILE_MACHINE_AMD64: gdef.PROCESSOR_ARCHITECTURE_AMD64,
     gdef.IMAGE_FILE_MACHINE_ARM64: gdef.PROCESSOR_ARCHITECTURE_ARM64,
-    gdef:IMAGE_FILE_MACHINE_UNKNOWN: gdef.PROCESSOR_ARCHITECTURE_UNKNOWN
+    gdef.IMAGE_FILE_MACHINE_UNKNOWN: gdef.PROCESSOR_ARCHITECTURE_UNKNOWN
 }
 
 def image_file_machine_to_processor_architecture(image_file_machine):