diff --git a/Chan.cpp b/Chan.cpp
index cdfd694a..287eecb3 100644
--- a/Chan.cpp
+++ b/Chan.cpp
@@ -538,7 +538,7 @@ void CChan::ClearBuffer() {
 
 void CChan::TrimBuffer(const unsigned int uMax) {
 	if (m_vsBuffer.size() > uMax) {
-		m_vsBuffer.erase(m_vsBuffer.begin(), m_vsBuffer.begin() + (uMax - m_vsBuffer.size()));
+		m_vsBuffer.erase(m_vsBuffer.begin(), m_vsBuffer.begin() + (m_vsBuffer.size() - uMax));
 	}
 }