diff --git a/DESCRIPTION b/DESCRIPTION
index 07c503ae..d8ed08c3 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: osmdata
 Title: Import 'OpenStreetMap' Data as Simple Features or Spatial Objects
-Version: 0.1.8.010
+Version: 0.1.8.011
 Authors@R: c(
     person("Mark", "Padgham", , "mark.padgham@email.com", role = c("aut", "cre")),
     person("Bob", "Rudis", role = "aut"),
@@ -37,6 +37,7 @@ Imports:
     magrittr,
     methods,
     Rcpp (>= 0.12.4),
+    reproj,
     rvest,
     sp,
     tibble,
diff --git a/NEWS.md b/NEWS.md
index bc5e14bc..ba86d06d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -7,6 +7,11 @@ Major changes:
   *around* a defined location; thanks to @barryrowlingson via #199 and
   @maellecoursonnais via #238
 
+Minor changes:
+
+- New dependency on `reproj` package, so that `trim_osmdata()` can be applied
+  to re-projected coordinates.
+
 0.1.8
 ===================
 
diff --git a/R/trim-osmdata.R b/R/trim-osmdata.R
index 1a575ff0..075b2227 100644
--- a/R/trim-osmdata.R
+++ b/R/trim-osmdata.R
@@ -63,6 +63,10 @@ trim_osmdata_sfp <- function (dat, bb_poly, exclude = TRUE) {
 
     if (nrow (bb_poly) > 1) {
 
+        srcproj <- .lonlat() #"+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"
+        crs <- .sph_merc() # "+proj=merc +a=6378137 +b=6378137"
+        bb_poly <- reproj::reproj (bb_poly, target = crs, source = srcproj) [, 1:2]
+
         dat <- trim_to_poly_pts (dat, bb_poly, exclude = exclude) %>%
             trim_to_poly (bb_poly = bb_poly, exclude = exclude) %>%
             trim_to_poly_multi (bb_poly = bb_poly, exclude = exclude)
@@ -132,7 +136,11 @@ trim_to_poly_pts <- function (dat, bb_poly, exclude = TRUE) {
 
     if (is (dat$osm_points, "sf")) {
 
+        srcproj <- .lonlat() #"+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"
+        crs <- .sph_merc() # "+proj=merc +a=6378137 +b=6378137"
+
         g <- do.call (rbind, dat$osm_points$geometry)
+        g <- reproj::reproj (g, target = crs, source = srcproj)
         indx <- sp::point.in.polygon (g [, 1], g [, 2],
                                       bb_poly [, 1], bb_poly [, 2])
         if (exclude)
@@ -160,10 +168,14 @@ trim_to_poly_pts <- function (dat, bb_poly, exclude = TRUE) {
 #' @noRd
 get_trim_indx <- function (g, bb, exclude) {
 
+    srcproj <- .lonlat() #"+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"
+    crs <- .sph_merc() # "+proj=merc +a=6378137 +b=6378137"
+
     indx <- lapply (g, function (i) {
 
                         if (is.list (i)) # polygons
                             i <- i [[1]]
+                        i <- reproj::reproj (as.matrix (i), target = crs, source = srcproj)
                         inp <- sp::point.in.polygon (i [, 1], i [, 2],
                                                      bb [, 1], bb [, 2])
                         if ((exclude & all (inp > 0)) |
diff --git a/codemeta.json b/codemeta.json
index 80ac205f..c974c627 100644
--- a/codemeta.json
+++ b/codemeta.json
@@ -10,13 +10,13 @@
   "codeRepository": "https://github.com/ropensci/osmdata/",
   "issueTracker": "https://github.com/ropensci/osmdata/issues",
   "license": "https://spdx.org/licenses/GPL-3.0",
-  "version": "0.1.8.010",
+  "version": "0.1.8.11",
   "programmingLanguage": {
     "@type": "ComputerLanguage",
     "name": "R",
     "url": "https://r-project.org"
   },
-  "runtimePlatform": "R version 4.1.1 (2021-08-10)",
+  "runtimePlatform": "R version 4.1.2 (2021-11-01)",
   "provider": {
     "@id": "https://cran.r-project.org",
     "@type": "Organization",
@@ -272,6 +272,18 @@
       },
       "sameAs": "https://CRAN.R-project.org/package=Rcpp"
     },
+    {
+      "@type": "SoftwareApplication",
+      "identifier": "reproj",
+      "name": "reproj",
+      "provider": {
+        "@id": "https://cran.r-project.org",
+        "@type": "Organization",
+        "name": "Comprehensive R Archive Network (CRAN)",
+        "url": "https://cran.r-project.org"
+      },
+      "sameAs": "https://CRAN.R-project.org/package=reproj"
+    },
     {
       "@type": "SoftwareApplication",
       "identifier": "rvest",
@@ -332,28 +344,12 @@
   ],
   "applicationCategory": "DataAccess",
   "isPartOf": "https://ropensci.org",
-  "keywords": [
-    "open0street0map",
-    "openstreetmap",
-    "overpass0API",
-    "OSM",
-    "overpass-api",
-    "r",
-    "cpp",
-    "rstats",
-    "osm",
-    "osm-data",
-    "r-package",
-    "peer-reviewed"
-  ],
-  "contIntegration": [
-    "https://github.com/ropensci/osmdata/actions?query=workflow%3AR-CMD-check",
-    "https://codecov.io/gh/ropensci/osmdata"
-  ],
+  "keywords": ["open0street0map", "openstreetmap", "overpass0API", "OSM", "overpass-api", "r", "cpp", "rstats", "osm", "osm-data", "r-package", "peer-reviewed"],
+  "contIntegration": ["https://github.com/ropensci/osmdata/actions?query=workflow%3AR-CMD-check", "https://codecov.io/gh/ropensci/osmdata"],
   "developmentStatus": "https://www.repostatus.org/#active",
   "releaseNotes": "https://github.com/ropensci/osmdata/blob/master/NEWS.md",
   "readme": "https://github.com/ropensci/osmdata/blob/main/README.md",
-  "fileSize": "7782.91KB",
+  "fileSize": "7784.406KB",
   "citation": [
     {
       "@type": "ScholarlyArticle",
@@ -390,10 +386,7 @@
         "issueNumber": "14",
         "datePublished": "2017",
         "isPartOf": {
-          "@type": [
-            "PublicationVolume",
-            "Periodical"
-          ],
+          "@type": ["PublicationVolume", "Periodical"],
           "volumeNumber": "2",
           "name": "The Journal of Open Source Software"
         }
diff --git a/tests/testthat/test-trim.R b/tests/testthat/test-trim.R
index 9eb5d909..4a46d1dd 100644
--- a/tests/testthat/test-trim.R
+++ b/tests/testthat/test-trim.R
@@ -37,12 +37,12 @@ test_that ("trim_osm_data", {
                expect_equal (nrow (x1$edge), 0)
                expect_equal (nrow (x1$vertex), 0)
 
-               bb <- list (cbind (c (0, 0),
+               bb <- list (rbind (c (0, 0),
                                   c (0, 1),
                                   c (1, 1),
                                   c (1, 0),
                                   c (0, 0)),
-                           cbind (c (2, 3),
+                           rbind (c (2, 3),
                                   c (2, 4),
                                   c (3, 4),
                                   c (3, 3),