diff --git a/src/headers/tomcrypt_custom.h b/src/headers/tomcrypt_custom.h
index e9ee7ec..80b9957 100644
--- a/src/headers/tomcrypt_custom.h
+++ b/src/headers/tomcrypt_custom.h
@@ -549,6 +549,7 @@
 #define LTC_MUTEX_INIT(x)     LTC_ARGCHK(pthread_mutex_init(x, NULL) == 0);
 #define LTC_MUTEX_LOCK(x)     LTC_ARGCHK(pthread_mutex_lock(x) == 0);
 #define LTC_MUTEX_UNLOCK(x)   LTC_ARGCHK(pthread_mutex_unlock(x) == 0);
+#define LTC_MUTEX_DESTROY(x)  LTC_ARGCHK(pthread_mutex_destroy(x) == 0);
 
 #else
 
@@ -559,6 +560,7 @@
 #define LTC_MUTEX_INIT(x)
 #define LTC_MUTEX_LOCK(x)
 #define LTC_MUTEX_UNLOCK(x)
+#define LTC_MUTEX_DESTROY(x)
 
 #endif
 
diff --git a/src/prngs/chacha20.c b/src/prngs/chacha20.c
index ac1f8a2..72a6d63 100644
--- a/src/prngs/chacha20.c
+++ b/src/prngs/chacha20.c
@@ -139,6 +139,7 @@ int chacha20_prng_done(prng_state *prng)
    prng->ready = 0;
    err = chacha_done(&prng->chacha.s);
    LTC_MUTEX_UNLOCK(&prng->lock);
+   LTC_MUTEX_DESTROY(&prng->lock);
    return err;
 }
 
diff --git a/src/prngs/fortuna.c b/src/prngs/fortuna.c
index 4a520d4..7b1ecb6 100644
--- a/src/prngs/fortuna.c
+++ b/src/prngs/fortuna.c
@@ -318,6 +318,7 @@ LBL_UNLOCK:
    zeromem(tmp, sizeof(tmp));
 #endif
    LTC_MUTEX_UNLOCK(&prng->lock);
+   LTC_MUTEX_DESTROY(&prng->lock);
    return err;
 }
 
diff --git a/src/prngs/rc4.c b/src/prngs/rc4.c
index 5ae91c4..e2aa921 100644
--- a/src/prngs/rc4.c
+++ b/src/prngs/rc4.c
@@ -142,6 +142,7 @@ int rc4_done(prng_state *prng)
    prng->ready = 0;
    err = rc4_stream_done(&prng->rc4.s);
    LTC_MUTEX_UNLOCK(&prng->lock);
+   LTC_MUTEX_DESTROY(&prng->lock);
    return err;
 }
 
diff --git a/src/prngs/sober128.c b/src/prngs/sober128.c
index 00b1d61..8d95491 100644
--- a/src/prngs/sober128.c
+++ b/src/prngs/sober128.c
@@ -141,6 +141,7 @@ int sober128_done(prng_state *prng)
    prng->ready = 0;
    err = sober128_stream_done(&prng->sober128.s);
    LTC_MUTEX_UNLOCK(&prng->lock);
+   LTC_MUTEX_DESTROY(&prng->lock);
    return err;
 }
 
diff --git a/src/prngs/yarrow.c b/src/prngs/yarrow.c
index 1a77e7f..e598834 100644
--- a/src/prngs/yarrow.c
+++ b/src/prngs/yarrow.c
@@ -262,6 +262,7 @@ int yarrow_done(prng_state *prng)
    err = ctr_done(&prng->yarrow.ctr);
 
    LTC_MUTEX_UNLOCK(&prng->lock);
+   LTC_MUTEX_DESTROY(&prng->lock);
    return err;
 }