diff --git a/project.h b/project.h
index ec3c1559..6c744415 100644
--- a/project.h
+++ b/project.h
@@ -54,16 +54,6 @@
 #define HASH_OF_HOST_BUF_SIZE      16
 #endif /* FEATURE_HTTPS_INSPECTION */
 
-#ifdef FEATURE_PTHREAD
-#  include <pthread.h>
-   typedef pthread_mutex_t privoxy_mutex_t;
-#else
-#  ifdef _WIN32
-#     include <windows.h>
-#  endif
-   typedef CRITICAL_SECTION privoxy_mutex_t;
-#endif
-
 #ifdef FEATURE_HTTPS_INSPECTION_MBEDTLS
 #include "mbedtls/net_sockets.h"
 #include "mbedtls/entropy.h"