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-rw-r--r--src/rt/circular_buffer.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rt/circular_buffer.cpp b/src/rt/circular_buffer.cpp
index 7c5d5848719..6753eb20f2e 100644
--- a/src/rt/circular_buffer.cpp
+++ b/src/rt/circular_buffer.cpp
@@ -24,7 +24,7 @@ circular_buffer::circular_buffer(rust_kernel *kernel, size_t unit_sz) :
 circular_buffer::~circular_buffer() {
     KLOG(kernel, mem, "~circular_buffer 0x%" PRIxPTR, this);
     assert(_buffer);
-    assert(_unread != 0 && "didn't expect bytes in the circular buffer");
+    assert(_unread == 0 && "didn't expect bytes in the circular buffer");
 
     kernel->free(_buffer);
 }