diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2db533e..59cab06 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,8 @@ add_library(airwin-registry STATIC
 
         ${AIRWIN_SOURCES})
 
+target_compile_definitions(airwin-registry PRIVATE _USE_MATH_DEFINES)
+
 if (NOT MSVC)
     # consistent even in warnings that chris is
     target_compile_options(airwin-registry PRIVATE
diff --git a/src/airwin2rackbase.cpp b/src/airwin2rackbase.cpp
index 7c3baf3..190bbac 100644
--- a/src/airwin2rackbase.cpp
+++ b/src/airwin2rackbase.cpp
@@ -7,6 +7,7 @@
 */
 
 #include "airwin2rackbase.h"
+#include <string>
 #include <iostream>
 
 float Airwin2RackBase::defaultSampleRate{0.f};