diff --git a/src/include/86box/nvr.h b/src/include/86box/nvr.h
index 85e0954f0..c6dc08a12 100644
--- a/src/include/86box/nvr.h
+++ b/src/include/86box/nvr.h
@@ -114,8 +114,8 @@ extern int   nvr_save(void);
 extern int  nvr_is_leap(int year);
 extern int  nvr_get_days(int month, int year);
 extern void nvr_time_sync(void);
-extern void nvr_time_get(struct tm *);
-extern void nvr_time_set(struct tm *);
+extern void nvr_time_get(void *priv);
+extern void nvr_time_set(void *priv);
 
 extern void nvr_reg_write(uint16_t reg, uint8_t val, void *priv);
 extern void nvr_at_handler(int set, uint16_t base, nvr_t *nvr);
diff --git a/src/nvr.c b/src/nvr.c
index d833618d0..d0b05b93a 100644
--- a/src/nvr.c
+++ b/src/nvr.c
@@ -326,14 +326,15 @@ nvr_time_sync(void)
 
 /* Get current time from internal clock. */
 void
-nvr_time_get(struct tm *tm)
+nvr_time_get(void *priv)
 {
-    uint8_t  dom;
-    uint8_t  mon;
-    uint8_t  sum;
-    uint8_t  wd;
-    uint16_t cent;
-    uint16_t yr;
+    struct tm *tm   = (struct tm *) priv;
+    uint8_t    dom;
+    uint8_t    mon;
+    uint8_t    sum;
+    uint8_t    wd;
+    uint16_t   cent;
+    uint16_t   yr;
 
     tm->tm_sec  = intclk.tm_sec;
     tm->tm_min  = intclk.tm_min;
@@ -352,8 +353,10 @@ nvr_time_get(struct tm *tm)
 
 /* Set internal clock time. */
 void
-nvr_time_set(struct tm *tm)
+nvr_time_set(void *priv)
 {
+    struct tm *tm   = (struct tm *) priv;
+
     intclk.tm_sec  = tm->tm_sec;
     intclk.tm_min  = tm->tm_min;
     intclk.tm_hour = tm->tm_hour;