diff --git a/mdbx.h b/mdbx.h
index 414d6444..650f7f28 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -1898,7 +1898,7 @@ typedef enum MDBX_error_t MDBX_error_t;
  * \ingroup c_err
  * \deprecated Please review your code to use MDBX_UNABLE_EXTEND_MAPSIZE
  * instead. */
-MDBX_DEPRECATED static __inline int MDBX_MAP_RESIZED_is_deprecated() {
+MDBX_DEPRECATED static __inline int MDBX_MAP_RESIZED_is_deprecated(void) {
   return MDBX_UNABLE_EXTEND_MAPSIZE;
 }
 #define MDBX_MAP_RESIZED MDBX_MAP_RESIZED_is_deprecated()
diff --git a/src/lck-posix.c b/src/lck-posix.c
index 5753fdf1..a86febd5 100644
--- a/src/lck-posix.c
+++ b/src/lck-posix.c
@@ -148,7 +148,7 @@ mdbx_global_destructor(void) {
 
 #if MDBX_USE_OFDLOCKS
 static int op_setlk, op_setlkw, op_getlk;
-__cold static void choice_fcntl() {
+__cold static void choice_fcntl(void) {
   assert(!op_setlk && !op_setlkw && !op_getlk);
   if ((mdbx_runtime_flags & MDBX_DBG_LEGACY_MULTIOPEN) == 0
 #if defined(__linux__) || defined(__gnu_linux__)