diff --git a/src/system/kernel/thread.cpp b/src/system/kernel/thread.cpp
index 1315338f1c..b92bdec833 100644
--- a/src/system/kernel/thread.cpp
+++ b/src/system/kernel/thread.cpp
@@ -2847,6 +2847,11 @@ thread_block_timeout(timer* timer)
 static inline status_t
 thread_block_locked(Thread* thread)
 {
+	if (thread->pinned_to_cpu > 0) {
+		panic("attempting to block thread %" B_PRId32 ", which is pinned!",
+			thread->id);
+	}
+
 	if (thread->wait.status == 1) {
 		// check for signals, if interruptible
 		if (thread_is_interrupted(thread, thread->wait.flags)) {