diff --git a/src/header/pthread/cbindgen.toml b/src/header/pthread/cbindgen.toml
index 54b578f5be..cfac1a052e 100644
--- a/src/header/pthread/cbindgen.toml
+++ b/src/header/pthread/cbindgen.toml
@@ -14,7 +14,7 @@ after_includes = """
 
 
 // A value that shall not compare equal to any exiting thread.
-#define PTHREAD_NULL (pthread_t(NULL))
+#define PTHREAD_NULL ((pthread_t)NULL)
 
 #define PTHREAD_COND_INITIALIZER {0}
 #define PTHREAD_MUTEX_INITIALIZER {0}