diff --git a/benchmarks/CMakeLists.txt b/benchmarks/CMakeLists.txt
index 9a991896e..692ef46d5 100644
--- a/benchmarks/CMakeLists.txt
+++ b/benchmarks/CMakeLists.txt
@@ -12,7 +12,10 @@
 find_package(benchmark QUIET)
 
 add_executable(perf_class_sizes ClassSizes.cpp)
-target_link_libraries(perf_class_sizes PRIVATE geos)
+target_include_directories(perf_class_sizes PRIVATE
+            $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+            $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>)
+target_link_libraries(perf_class_sizes PRIVATE geos_cxx_flags)
 
 add_subdirectory(capi)