diff --git a/modules/ECMFindModuleHelpers.cmake b/modules/ECMFindModuleHelpers.cmake
--- a/modules/ECMFindModuleHelpers.cmake
+++ b/modules/ECMFindModuleHelpers.cmake
@@ -265,16 +265,16 @@
             list(APPEND ${module_name}_LIBRARIES
                         "${${module_name}_${ecm_fpwc_comp}_LIBRARY}")
             list(APPEND ${module_name}_INCLUDE_DIRS
-                        "${${module_name}_${ecm_fpwc_comp}_INCLUDE_DIR}")
+                        "${PKG_${module_name}_${ecm_fpwc_comp}_INCLUDE_DIRS}")
             set(${module_name}_DEFINITIONS
                     ${${module_name}_DEFINITIONS}
                     ${PKG_${module_name}_${ecm_fpwc_comp}_DEFINITIONS})
             if(NOT TARGET ${module_name}::${ecm_fpwc_comp})
                 add_library(${module_name}::${ecm_fpwc_comp} UNKNOWN IMPORTED)
                 set_target_properties(${module_name}::${ecm_fpwc_comp} PROPERTIES
                     IMPORTED_LOCATION "${${module_name}_${ecm_fpwc_comp}_LIBRARY}"
                     INTERFACE_COMPILE_OPTIONS "${PKG_${module_name}_${ecm_fpwc_comp}_DEFINITIONS}"
-                    INTERFACE_INCLUDE_DIRECTORIES "${${module_name}_${ecm_fpwc_comp}_INCLUDE_DIR}"
+                    INTERFACE_INCLUDE_DIRECTORIES "${PKG_${module_name}_${ecm_fpwc_comp}_INCLUDE_DIRS}"
                     INTERFACE_LINK_LIBRARIES "${ecm_fpwc_dep_targets}"
                 )
             endif()