diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d4a39b..ac4c5ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ add_library(argparse::argparse ALIAS argparse)
 target_compile_features(argparse INTERFACE cxx_std_17)
 target_include_directories(argparse INTERFACE
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
-  $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}>/include)
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>)
 
 if(ARGPARSE_BUILD_TESTS)
   add_subdirectory(test)