diff --git a/pkgs/development/interpreters/dhall/build-dhall-github-package.nix b/pkgs/development/interpreters/dhall/build-dhall-github-package.nix
index 53adc5a9b125..8f9e4d835511 100644
--- a/pkgs/development/interpreters/dhall/build-dhall-github-package.nix
+++ b/pkgs/development/interpreters/dhall/build-dhall-github-package.nix
@@ -43,7 +43,7 @@ lib.makePackageOverridable
         "rev"
       ]);
 
-      prefix = lib.optionalString (directory != "") "${directory}/";
+      prefix = lib.optionalString (directory != "") "/${directory}";
 
     in
       buildDhallPackage
@@ -51,9 +51,12 @@ lib.makePackageOverridable
 
             name = versionedName;
 
-            code = "${src}/${prefix}${file}";
+            code = "${src}${prefix}/${file}";
           }
         // lib.optionalAttrs document
-          { documentationRoot = "${src}/${prefix}"; }
+          { documentationRoot = "${src}/${prefix}";
+
+            baseImportUrl = "https://raw.githubusercontent.com/${owner}/${repo}/${rev}${prefix}";
+          }
         )
   )
diff --git a/pkgs/development/interpreters/dhall/build-dhall-package.nix b/pkgs/development/interpreters/dhall/build-dhall-package.nix
index 9fc9a4412156..86797e9f136f 100644
--- a/pkgs/development/interpreters/dhall/build-dhall-package.nix
+++ b/pkgs/development/interpreters/dhall/build-dhall-package.nix
@@ -37,6 +37,12 @@
   #
   # If `null`, then no documentation is generated.
 , documentationRoot ? null
+
+  # Base URL prepended to paths copied to the clipboard
+  #
+  # This is used in conjunction with `documentationRoot`, and is unused if
+  # `documentationRoot` is `null`.
+, baseImportUrl ? null
 }:
 
 let
@@ -85,6 +91,12 @@ in
     ${lib.optionalString (documentationRoot != null) ''
     mkdir -p $out/${dataDhall}
 
-    XDG_DATA_HOME=$out/${data} ${dhall-docs}/bin/dhall-docs --input '${documentationRoot}' --package-name '${name}' --output-link $out/docs
+    XDG_DATA_HOME=$out/${data} ${dhall-docs}/bin/dhall-docs --output-link $out/docs ${lib.cli.toGNUCommandLineShell { } {
+      base-import-url = baseImportUrl;
+
+      input = documentationRoot;
+
+      package-name = name;
+    }}
     ''}
   ''