diff --git a/Modules/FindPython/Support.cmake b/Modules/FindPython/Support.cmake
index 40b0eca36e..f7bcc9caa4 100644
--- a/Modules/FindPython/Support.cmake
+++ b/Modules/FindPython/Support.cmake
@@ -1167,7 +1167,7 @@ function (_PYTHON_VALIDATE_INTERPRETER)
 
     if (WIN32)
       # In this case, check if the interpreter is compatible with the target processor architecture
-      if (_$_PYTHON_PREFIX}_ARCHITECTURE_ID MATCHES "ARM")
+      if (_${_PYTHON_PREFIX}_ARCHITECTURE_ID MATCHES "ARM")
         set(target_arm TRUE)
       else()
         set(target_arm FALSE)