diff --git a/language/CMakeLists.txt b/language/CMakeLists.txt
--- a/language/CMakeLists.txt
+++ b/language/CMakeLists.txt
@@ -174,6 +174,7 @@
     codegen/progressdialogs/refactoringdialog.ui)
 
 kdevplatform_add_library(KDevPlatformLanguage SOURCES ${KDevPlatformLanguage_LIB_SRCS})
+target_include_directories(KDevPlatformLanguage PRIVATE ${Boost_INCLUDE_DIRS})
 target_link_libraries(KDevPlatformLanguage LINK_PUBLIC
         KF5::ThreadWeaver
         KDev::Interfaces