diff --git a/src/server/CMakeLists.txt b/src/server/CMakeLists.txt
index debfae93dac..f1a07f29983 100644
--- a/src/server/CMakeLists.txt
+++ b/src/server/CMakeLists.txt
@@ -88,6 +88,8 @@ add_library(qgis_server SHARED ${QGIS_SERVER_SRCS} ${QGIS_SERVER_HDRS})
 
 target_precompile_headers(qgis_server PRIVATE $<$<COMPILE_LANGUAGE:CXX>:${CMAKE_SOURCE_DIR}/src/core/qgis.h>)
 
+set_target_properties(qgis_server PROPERTIES UNITY_BUILD ${ENABLE_UNITY_BUILDS})
+
 # require c++17
 target_compile_features(qgis_server PRIVATE cxx_std_17)