diff --git a/src/crypto/scrypt.cpp b/src/crypto/scrypt.cpp
index 4c57e22d5..da02f5ead 100644
--- a/src/crypto/scrypt.cpp
+++ b/src/crypto/scrypt.cpp
@@ -254,7 +254,7 @@ void scrypt_detect_sse2()
 
 void scrypt_1024_1_1_256(const char *input, char *output)
 {
-    static char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
+    thread_local char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
     memset(scratchpad, 0, sizeof(scratchpad));
     scrypt_1024_1_1_256_sp(input, output, scratchpad);
 }