diff --git a/src/x11_monitor.c b/src/x11_monitor.c
index 1f804aeb..fb3a67ba 100644
--- a/src/x11_monitor.c
+++ b/src/x11_monitor.c
@@ -164,7 +164,7 @@ void _glfwPollMonitorsX11(void)
             if (widthMM <= 0 || heightMM <= 0)
             {
                 // HACK: If RandR does not provide a physical size, assume the
-                //       X11 default 96 DPI and calcuate from the CRTC viewport
+                //       X11 default 96 DPI and calculate from the CRTC viewport
                 // NOTE: These members are affected by rotation, unlike the mode
                 //       info and output info members
                 widthMM  = (int) (ci->width * 25.4f / 96.f);