diff --git a/src/event/event.c b/src/event/event.c
index 6ace80ecb..33df9f171 100644
--- a/src/event/event.c
+++ b/src/event/event.c
@@ -792,7 +792,7 @@ static void
 _dispatch_timer_unote_disarm(dispatch_timer_source_refs_t dt,
 		dispatch_timer_heap_t dth)
 {
-	uint32_t tidx = dt->du_ident;
+	uint32_t tidx = (uint32_t)dt->du_ident;
 
 	dispatch_assert(_dispatch_unote_armed(dt));
 	_dispatch_timer_heap_remove(&dth[tidx], dt);
diff --git a/src/event/event_internal.h b/src/event/event_internal.h
index 14c485ee3..5b2c7fc80 100644
--- a/src/event/event_internal.h
+++ b/src/event/event_internal.h
@@ -125,6 +125,8 @@ _dispatch_timer_flags_from_clock(dispatch_clock_t clock)
 
 #if defined(_WIN32)
 typedef uintptr_t dispatch_unote_ident_t;
+#elif defined(__OpenBSD__)
+typedef uintptr_t dispatch_unote_ident_t;
 #else
 typedef uint32_t dispatch_unote_ident_t;
 #endif
diff --git a/src/event/event_kevent.c b/src/event/event_kevent.c
index 819649dbe..c91490fa8 100644
--- a/src/event/event_kevent.c
+++ b/src/event/event_kevent.c
@@ -240,9 +240,9 @@ dispatch_kevent_debug(const char *verb, const dispatch_kevent_s *kev,
 
 #define _dispatch_du_debug(what, du) \
 		_dispatch_debug("kevent-source[%p]: %s kevent[%p] " \
-				"{ filter = %s, ident = 0x%x }", \
+				"{ filter = %s, ident = 0x%llx }", \
 				_dispatch_wref2ptr((du)->du_owner_wref), what, \
-				(du), _evfiltstr((du)->du_filter), (du)->du_ident)
+				(du), _evfiltstr((du)->du_filter), (unsigned long long)(du)->du_ident)
 
 #if DISPATCH_MACHPORT_DEBUG
 #ifndef MACH_PORT_TYPE_SPREQUEST
diff --git a/src/init.c b/src/init.c
index 0fe0e4385..af5c91b58 100644
--- a/src/init.c
+++ b/src/init.c
@@ -1049,7 +1049,7 @@ _dispatch_bug_kevent_vanished(dispatch_unote_t du)
 			"{ %p[%s], ident: %" PRIdPTR " / 0x%" PRIxPTR ", handler: %p }",
 			dux_type(du._du)->dst_kind, dou._dq,
 			dou._dq->dq_label ? dou._dq->dq_label : "<unknown>",
-			du._du->du_ident, du._du->du_ident, func);
+			(intptr_t)du._du->du_ident, (uintptr_t)du._du->du_ident, func);
 }
 
 #endif // RDAR_49023449
@@ -1154,8 +1154,8 @@ _dispatch_logv_init(void *context DISPATCH_UNUSED)
 			}
 #else
 			dprintf(dispatch_logfile, "=== log file opened for %s[%u] at "
-					"%ld.%06u ===\n", getprogname() ?: "", getpid(),
-					tv.tv_sec, (int)tv.tv_usec);
+					"%lld.%06u ===\n", getprogname() ?: "", getpid(),
+					(time_t)tv.tv_sec, (int)tv.tv_usec);
 #endif
 		}
 	}
diff --git a/src/source.c b/src/source.c
index d1581351d..69b731d92 100644
--- a/src/source.c
+++ b/src/source.c
@@ -1401,8 +1401,8 @@ _dispatch_source_debug_attr(dispatch_source_t ds, char* buf, size_t bufsiz)
 	return dsnprintf(buf, bufsiz, "target = %s[%p], ident = 0x%llx, "
 			"mask = 0x%x, pending_data = 0x%llx, registered = %d, "
 			"armed = %d, %s%s%s",
-			target && target->dq_label ? target->dq_label : "", target,
-			(unsigned long long)dr->du_ident, dr->du_fflags,
+			target && target->dq_label ? target->dq_label : "",
+			target, (unsigned long long)dr->du_ident, dr->du_fflags,
 			(unsigned long long)dr->ds_pending_data,
 			_du_state_registered(du_state), _du_state_armed(du_state),
 			(dqf & DSF_CANCELED) ? "cancelled, " : "",