diff --git a/crates/algorithms/algorithms-c/src/hash/sha2.c b/crates/algorithms/algorithms-c/src/hash/sha2.c
index c704820..0ee0ace 100644
--- a/crates/algorithms/algorithms-c/src/hash/sha2.c
+++ b/crates/algorithms/algorithms-c/src/hash/sha2.c
@@ -3,7 +3,6 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
-#include <threads.h>
 
 #ifdef TEST
 // if you want to get the internals of sha2 printed, uncomment the line below