diff --git a/CMakeLists.txt b/CMakeLists.txt
index 048f6cfe71..93189f7aac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -512,7 +512,7 @@ if(ENABLE_LIBRESSL_INSTALL)
 		set(prefix      ${CMAKE_INSTALL_PREFIX})
 		set(exec_prefix \${prefix})
 		set(libdir      \${exec_prefix}/${CMAKE_INSTALL_LIBDIR})
-		set(includedir  \${prefix}/include)
+		set(includedir  \${prefix}/${CMAKE_INSTALL_INCLUDEDIR})
 		if(PLATFORM_LIBS)
 			string(REGEX REPLACE ";" " -l" PLATFORM_LDADD ";${PLATFORM_LIBS}")
 		endif()