diff --git a/NEWS.md b/NEWS.md
index 915f82f9c9..796a64d230 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,7 @@
 # ggplot2 (development version)
 
+* Fixed bug in `coord_sf()` where graticule lines didn't obey 
+  `panel.grid.major`'s linewidth setting (@teunbrand, #5179)
 * The `datetime_scale()` scale constructor is now exported for use in extension
   packages (@teunbrand, #4701).
 * `geom_text()` drops observations where `angle = NA` instead of throwing an
diff --git a/R/coord-sf.R b/R/coord-sf.R
index a2c2a49121..986c5bf6b7 100644
--- a/R/coord-sf.R
+++ b/R/coord-sf.R
@@ -305,7 +305,7 @@ CoordSf <- ggproto("CoordSf", CoordCartesian,
     } else {
       line_gp <- gpar(
         col = el$colour,
-        lwd = len0_null(el$size*.pt),
+        lwd = len0_null(el$linewidth * .pt),
         lty = el$linetype
       )
       grobs <- c(