diff --git a/README.md b/README.md
index 50b0a945..be2be12b 100755
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ This module is powered by the blazingly fast [libvips](https://github.com/jcupit
 
 ### Install libvips on Mac OS
 
-	brew install homebrew/science/vips --with-webp
+	brew install homebrew/science/vips --with-webp --with-graphicsmagick
 
 The _gettext_ dependency of _libvips_ [can lead](https://github.com/lovell/sharp/issues/9) to a `library not found for -lintl` error. If so, please try:
 
diff --git a/src/sharp.cc b/src/sharp.cc
index c7bca46a..b8409ef4 100755
--- a/src/sharp.cc
+++ b/src/sharp.cc
@@ -33,7 +33,8 @@ typedef enum {
   JPEG,
   PNG,
   WEBP,
-  TIFF
+  TIFF,
+  MAGICK
 } ImageType;
 
 unsigned char MARKER_JPEG[] = {0xff, 0xd8};
@@ -98,25 +99,30 @@ class ResizeWorker : public NanAsyncWorker {
         (baton->err).append("Unsupported input buffer");
         return;
       }
-    } else if (is_jpeg(baton->file_in)) {
+    } else if (vips_foreign_is_a("jpegload", baton->file_in.c_str())) {
       if (vips_jpegload((baton->file_in).c_str(), &in, "access", baton->access_method, NULL)) {
         return resize_error(baton, in);
       }
-    } else if (is_png(baton->file_in)) {
+    } else if (vips_foreign_is_a("pngload", baton->file_in.c_str())) {
       inputImageType = PNG;
       if (vips_pngload((baton->file_in).c_str(), &in, "access", baton->access_method, NULL)) {
         return resize_error(baton, in);
       }
-    } else if (is_webp(baton->file_in)) {
+    } else if (vips_foreign_is_a("webpload", baton->file_in.c_str())) {
       inputImageType = WEBP;
       if (vips_webpload((baton->file_in).c_str(), &in, "access", baton->access_method, NULL)) {
         return resize_error(baton, in);
       }
-    } else if (is_tiff(baton->file_in)) {
+    } else if (vips_foreign_is_a("tiffload", baton->file_in.c_str())) {
       inputImageType = TIFF;
       if (vips_tiffload((baton->file_in).c_str(), &in, "access", baton->access_method, NULL)) {
         return resize_error(baton, in);
       }
+    } else if(vips_foreign_is_a("magickload", (baton->file_in).c_str())) {
+      inputImageType = MAGICK;
+      if (vips_magickload((baton->file_in).c_str(), &in, "access", baton->access_method, NULL)) {
+        return resize_error(baton, in);
+      }
     } else {
       resize_error(baton, in);
       (baton->err).append("Unsupported input file " + baton->file_in);