diff --git a/find-modules/FindPythonModuleGeneration.cmake b/find-modules/FindPythonModuleGeneration.cmake
--- a/find-modules/FindPythonModuleGeneration.cmake
+++ b/find-modules/FindPythonModuleGeneration.cmake
@@ -445,7 +445,7 @@
             OUTPUT_NAME "${modulename_value}")
 
         if (GPB_SIP_DEPENDS MATCHES PyKF5)
-          set(_kf5_python_prefix ${CMAKE_INSTALL_PREFIX}/lib/python${pyversion${pyversion}_maj_min}/${GPB_INSTALL_DIR_SUFFIX})
+          set(_kf5_python_prefix ${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}/python${pyversion${pyversion}_maj_min}/${GPB_INSTALL_DIR_SUFFIX})
         else()
           set(_kf5_python_prefix ${CMAKE_BINARY_DIR}/py${pyversion})
         endif()
@@ -454,10 +454,16 @@
             ${_kf5_python_prefix}
         )
 
+        if (pyversion EQUAL "3")
+          set(sipversion ${pyversion})
+        else ()
+          set(sipversion "")
+        endif()
+
         install(DIRECTORY ${CMAKE_BINARY_DIR}/py${pyversion}/${pythonnamespace_value}
-            DESTINATION lib/python${pyversion${pyversion}_maj_min}/${GPB_INSTALL_DIR_SUFFIX})
+            DESTINATION lib${LIB_SUFFIX}/python${pyversion${pyversion}_maj_min}/${GPB_INSTALL_DIR_SUFFIX})
         install(FILES ${sip_files} "${CMAKE_CURRENT_BINARY_DIR}/sip/${pythonnamespace_value}/${modulename_value}/${modulename_value}mod.sip"
-          DESTINATION share/sip/${pythonnamespace_value}/${modulename_value}
+          DESTINATION share/sip${sipversion}/${pythonnamespace_value}/${modulename_value}
         )
     endforeach()
 endfunction()