diff --git a/src/system/kernel/locks/lock.cpp b/src/system/kernel/locks/lock.cpp
index fda4d321b6..caebd36c5b 100644
--- a/src/system/kernel/locks/lock.cpp
+++ b/src/system/kernel/locks/lock.cpp
@@ -891,7 +891,7 @@ dump_mutex_info(int argc, char** argv)
 #if KDEBUG
 	kprintf("  holder:          %" B_PRId32 "\n", lock->holder);
 #else
-	kprintf("  count:           %ld\n", lock->count);
+	kprintf("  count:           %" B_PRId32 "\n", lock->count);
 #endif
 
 	kprintf("  waiting threads:");
diff --git a/src/system/kernel/sem.cpp b/src/system/kernel/sem.cpp
index 747428e4c9..13fe243b4d 100644
--- a/src/system/kernel/sem.cpp
+++ b/src/system/kernel/sem.cpp
@@ -209,7 +209,7 @@ dump_sem(struct sem_entry* sem)
 		else
 			unset_debug_variable("_releaser");
 #else
-		kprintf("last acquired by: %ld\n", sem->u.used.last_acquirer);
+		kprintf("last acquired by: %" B_PRId32 "\n", sem->u.used.last_acquirer);
 #endif
 
 		if (sem->u.used.last_acquirer != 0)