diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 306ba1a6e..87cbe8174 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -76,6 +76,10 @@ if(MSVC AND NOT BUILD_SHARED_LIBS)
   set_target_properties(${LIB_NAME} PROPERTIES STATIC_LIBRARY_FLAGS ${CMAKE_EXE_LINKER_FLAGS})
 endif()
 
+if(NOT BUILD_SHARED_LIBS)
+    set_target_properties(${LIB_NAME} PROPERTIES INTERFACE_COMPILE_DEFINITIONS CURL_STATICLIB)
+endif()
+
 target_link_libraries(${LIB_NAME} ${CURL_LIBS})
 
 if(WIN32)