diff --git a/features/mbedtls/targets/TARGET_STM/md5_alt.c b/features/mbedtls/targets/TARGET_STM/md5_alt.c
index 5a3e816f93..1a954ca213 100644
--- a/features/mbedtls/targets/TARGET_STM/md5_alt.c
+++ b/features/mbedtls/targets/TARGET_STM/md5_alt.c
@@ -100,6 +100,8 @@ void mbedtls_md5_starts( mbedtls_md5_context *ctx )
 
     /* HASH Configuration */
     ctx->hhash_md5.Init.DataType = HASH_DATATYPE_8B;
+    /* clear CR ALGO value */
+    HASH->CR &= ~HASH_CR_ALGO_Msk;
     if (HAL_HASH_Init(&ctx->hhash_md5) != 0) {
         // return error code
         return;
diff --git a/features/mbedtls/targets/TARGET_STM/sha1_alt.c b/features/mbedtls/targets/TARGET_STM/sha1_alt.c
index 98317c21fa..cfd90416f2 100644
--- a/features/mbedtls/targets/TARGET_STM/sha1_alt.c
+++ b/features/mbedtls/targets/TARGET_STM/sha1_alt.c
@@ -98,6 +98,8 @@ void mbedtls_sha1_starts( mbedtls_sha1_context *ctx )
 
     /* HASH Configuration */
     ctx->hhash_sha1.Init.DataType = HASH_DATATYPE_8B;
+    /* clear CR ALGO value */
+    HASH->CR &= ~HASH_CR_ALGO_Msk;
     if (HAL_HASH_Init(&ctx->hhash_sha1) == HAL_ERROR) {
         // error found to be returned
         return;
diff --git a/features/mbedtls/targets/TARGET_STM/sha256_alt.c b/features/mbedtls/targets/TARGET_STM/sha256_alt.c
index a3354e9968..6729cdac2e 100644
--- a/features/mbedtls/targets/TARGET_STM/sha256_alt.c
+++ b/features/mbedtls/targets/TARGET_STM/sha256_alt.c
@@ -99,6 +99,8 @@ void mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 )
     ctx->is224 = is224;
     /* HASH Configuration */
     ctx->hhash_sha256.Init.DataType = HASH_DATATYPE_8B;
+    /* clear CR ALGO value */
+    HASH->CR &= ~HASH_CR_ALGO_Msk;
     if (HAL_HASH_Init(&ctx->hhash_sha256) == HAL_ERROR) {
         // error found to be returned
         return;