diff --git a/src/nsterm.m b/src/nsterm.m
index 2f736980ea6..dc4aef55113 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -5256,8 +5256,11 @@ static Lisp_Object ns_string_to_lispmod (const char *s)
     NSScreen *screen = [NSScreen mainScreen];
     NSWindowDepth depth = [screen depth];
 
-    dpyinfo->resx = 72.27; /* used 75.0, but this makes pt == pixel, expected */
-    dpyinfo->resy = 72.27;
+    NSDictionary *dict = [screen deviceDescription];
+    NSSize res = [[dict objectForKey:@"NSDeviceResolution"] sizeValue];
+    dpyinfo->resx = res.width;
+    dpyinfo->resy = res.height;
+
     dpyinfo->color_p = ![NSDeviceWhiteColorSpace isEqualToString:
                                                   NSColorSpaceFromDepth (depth)]
                 && ![NSCalibratedWhiteColorSpace isEqualToString: