diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 94672b5..aa46631 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -96,6 +96,8 @@ if(ENABLE_SHARED_LIB)
     C_VISIBILITY_PRESET hidden
   )
 
+  target_include_directories(nghttp3 INTERFACE $<INSTALL_INTERFACE:include>)
+
   install(TARGETS nghttp3
     EXPORT ${NGHTTP3_TARGETS_EXPORT_NAME} 
     ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
@@ -113,6 +115,8 @@ if(ENABLE_STATIC_LIB)
     )
   target_compile_definitions(nghttp3_static PUBLIC "-DNGHTTP3_STATICLIB")
 
+  target_include_directories(nghttp3_static INTERFACE $<INSTALL_INTERFACE:include>)
+
   install(TARGETS nghttp3_static
     EXPORT ${NGHTTP3_TARGETS_EXPORT_NAME} 
     DESTINATION "${CMAKE_INSTALL_LIBDIR}")