diff --git a/cmake/jkqtplotter_macros.cmake b/cmake/jkqtplotter_macros.cmake
index 4589f2ab12b..771adcf4053 100644
--- a/cmake/jkqtplotter_macros.cmake
+++ b/cmake/jkqtplotter_macros.cmake
@@ -65,7 +65,8 @@ include(GNUInstallDirs)
 
 
 
-function(jkqtplotter_installlibrary_new lib_name libIncludeSubdir libSrcDir)
+function(jkqtplotter_installlibrary_new lib_name libBasename libSrcDir)
+    string(TOLOWER "${libBasename}" libIncludeSubdir)
 
     # export targets (including headers!)
     install(TARGETS ${lib_name}
@@ -78,7 +79,6 @@ function(jkqtplotter_installlibrary_new lib_name libIncludeSubdir libSrcDir)
     )
     # generate ...Config.cmake
     set(JKQTP_CURRENT_TARGET_FILENAME "${lib_name}Targets.cmake")
-    set(libBasename "${libIncludeSubdir}")
     configure_file(${libSrcDir}/LibTarget.cmake.in "${CMAKE_CURRENT_BINARY_DIR}/${lib_name}Config.cmake" @ONLY)
     # install export files
     install(EXPORT ${lib_name}_TARGETS