diff --git a/cmake-modules/KDEPython.cmake b/cmake-modules/KDEPython.cmake
--- a/cmake-modules/KDEPython.cmake
+++ b/cmake-modules/KDEPython.cmake
@@ -47,7 +47,7 @@
     # Setting because it will be displayed later, in compile_python_files
     set(_message "Byte-compiling ${_bin_py} to ${_bin_pyc}")
 
-    string(REPLACE "/" "_" _rule_name "${_basepath}/${_bin_pyc}")
+    string(REPLACE "/" "_" _rule_name "${_filename}_rule")
     add_custom_target("${_rule_name}" ALL)
 
     get_filename_component(_abs_bin_py ${_bin_py} ABSOLUTE)