diff --git a/src/os_unix.c b/src/os_unix.c
index dc08408..de6e661 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -4434,7 +4434,7 @@
     ws.ws_col = cols;
     ws.ws_row = rows;
 
-    // calcurate and set tty pixel size
+    // calculate and set tty pixel size
     struct cellsize cs;
     mch_calc_cell_size(&cs);