diff --git a/subprojects/libcr51sign/src/libcr51sign.c b/subprojects/libcr51sign/src/libcr51sign.c
index c631408..fff1826 100644
--- a/subprojects/libcr51sign/src/libcr51sign.c
+++ b/subprojects/libcr51sign/src/libcr51sign.c
@@ -13,10 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include <assert.h>
 #include <libcr51sign/libcr51sign.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 
 #ifdef __cplusplus
diff --git a/subprojects/libcr51sign/src/libcr51sign_support.c b/subprojects/libcr51sign/src/libcr51sign_support.c
index 6dddf23..ce5103d 100644
--- a/subprojects/libcr51sign/src/libcr51sign_support.c
+++ b/subprojects/libcr51sign/src/libcr51sign_support.c
@@ -13,13 +13,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+#include <libcr51sign/libcr51sign.h>
 #include <libcr51sign/libcr51sign_support.h>
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/pem.h>
 #include <openssl/rsa.h>
 #include <stdio.h>
-#include <string.h>
 
 #ifdef __cplusplus
 extern "C"