diff --git a/CMakeLists.txt b/CMakeLists.txt
index e15280a..65d2c43 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,6 +47,8 @@ cmake_dependent_option(
 opendaq_common_compile_targets_settings()
 opendaq_setup_compiler_flags(${REPO_OPTION_PREFIX})
 
+add_compile_definitions(FMT_HEADER_ONLY)
+
 if (${REPO_OPTION_PREFIX}_ENABLE_TESTS)
     message(STATUS "Unit tests in ${REPO_NAME} are ENABLED")
     enable_testing()