diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8259516..1693069 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,7 +58,9 @@ target_include_directories(GSL INTERFACE
     $<BUILD_INTERFACE:
         ${CMAKE_CURRENT_SOURCE_DIR}/include
     >
-    $<INSTALL_INTERFACE:include>
+    $<INSTALL_INTERFACE:
+        include
+    >
 )
 
 if ((CMAKE_VERSION GREATER 3.7.9) OR (CMAKE_VERSION EQUAL 3.7.9))