diff --git a/config/linux/pyconfig.h b/config/linux/pyconfig.h
index 6626449..9fbd312 100644
--- a/config/linux/pyconfig.h
+++ b/config/linux/pyconfig.h
@@ -37,4 +37,8 @@
 #define SIZEOF_PID_T            __SIZEOF_INT__
 #endif
 
+#ifndef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT
+#define PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT 1
+#endif
+
 #endif
diff --git a/config/midipix/pyconfig.h b/config/midipix/pyconfig.h
index 076ba74..5e87863 100644
--- a/config/midipix/pyconfig.h
+++ b/config/midipix/pyconfig.h
@@ -36,4 +36,8 @@
 #define SIZEOF_PID_T            __SIZEOF_INT__
 #endif
 
+#ifndef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT
+#define PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT 1
+#endif
+
 #endif