diff --git a/src/apps/terminal/BasicTerminalBuffer.cpp b/src/apps/terminal/BasicTerminalBuffer.cpp
index 6470031c02..41f85fad39 100644
--- a/src/apps/terminal/BasicTerminalBuffer.cpp
+++ b/src/apps/terminal/BasicTerminalBuffer.cpp
@@ -1352,7 +1352,7 @@ BasicTerminalBuffer::_InsertGap(int32 width)
 			line->cells + fCursor.x, toMove * sizeof(TerminalCell));
 	}
 
-	line->length += width;
+	line->length = min_c(line->length + width, fWidth);
 }