diff --git a/msi.c b/msi.c
index d84f917..46d6842 100644
--- a/msi.c
+++ b/msi.c
@@ -1839,7 +1839,7 @@ static char *msi_dirent_get(MSI_ENTRY *entry)
     return data;
 }
 
-static char *msi_unused_dirent_get()
+static char *msi_unused_dirent_get(void)
 {
     char *data = OPENSSL_malloc(DIRENT_SIZE);
 
diff --git a/osslsigncode.c b/osslsigncode.c
index c7a8741..8921446 100644
--- a/osslsigncode.c
+++ b/osslsigncode.c
@@ -3331,7 +3331,7 @@ static ENGINE *engine_dynamic(GLOBAL_OPTIONS *options)
  * [in] none
  * [returns] pointer to ENGINE
  */
-static ENGINE *engine_pkcs11()
+static ENGINE *engine_pkcs11(void)
 {
     ENGINE *engine = ENGINE_by_id("pkcs11");
     if (!engine) {