diff --git a/plugins/patchreview/CMakeLists.txt b/plugins/patchreview/CMakeLists.txt
index 9449d7cb0f..9ee50360fa 100644
--- a/plugins/patchreview/CMakeLists.txt
+++ b/plugins/patchreview/CMakeLists.txt
@@ -1,62 +1,63 @@
 find_package(LibKompareDiff2 5.0 CONFIG)
 set_package_properties(LibKompareDiff2 PROPERTIES
     PURPOSE "Required for building the patch review plugin."
     TYPE REQUIRED
 )
 
 find_package(KF5Purpose CONFIG QUIET)
 set_package_properties(KF5Purpose PROPERTIES DESCRIPTION "Support for patch sharing"
                        TYPE OPTIONAL
                       )
 if (NOT KF5Purpose_FOUND)
     find_package(KDEExperimentalPurpose QUIET)
     set_package_properties(KDEExperimentalPurpose PROPERTIES DESCRIPTION "EXPERIMENTAL. Support for patch sharing"
                         URL "https://projects.kde.org/projects/playground/libs/purpose"
                         TYPE OPTIONAL
                         )
 endif()
 
 add_definitions(-DTRANSLATION_DOMAIN=\"kdevpatchreview\")
 kde_enable_exceptions()
 
 if(LibKompareDiff2_VERSION VERSION_LESS 5.1)
     remove_definitions(
+        -DQT_NO_CAST_FROM_ASCII
         -DQT_NO_SIGNALS_SLOTS_KEYWORDS
     )
 endif()
 
 set(patchreview_PART_SRCS
     patchreview.cpp
     patchhighlighter.cpp
     patchreviewtoolview.cpp
     localpatchsource.cpp
 )
 
 ecm_qt_declare_logging_category(patchreview_PART_SRCS
     HEADER debug.h
     IDENTIFIER PLUGIN_PATCHREVIEW
     CATEGORY_NAME "kdevelop.plugins.patchreview"
 )
 ki18n_wrap_ui(patchreview_PART_SRCS patchreview.ui localpatchwidget.ui)
 
 qt5_add_resources(patchreview_PART_SRCS kdevpatchreview.qrc)
 kdevplatform_add_plugin(kdevpatchreview JSON kdevpatchreview.json SOURCES ${patchreview_PART_SRCS})
 target_link_libraries(kdevpatchreview
     KDev::Project
     KDev::Interfaces
     KDev::Util
     KDev::Language
     KDev::Vcs
     KDev::Sublime
     ${LIBKOMPAREDIFF2_LIBRARIES} # from cmake config file, has matching target name, which changed for 5.1
     KF5::IconThemes
     KF5::TextEditor
     KF5::Parts
 )
 if (KF5Purpose_FOUND)
     target_compile_definitions(kdevpatchreview PRIVATE WITH_PURPOSE)
     target_link_libraries(kdevpatchreview KF5::PurposeWidgets)
 elseif (KDEExperimentalPurpose_FOUND)
     target_compile_definitions(kdevpatchreview PRIVATE WITH_PURPOSE)
     target_link_libraries(kdevpatchreview KDEExperimental::PurposeWidgets)
 endif()