diff --git a/src/libutil/args.cc b/src/libutil/args.cc
index b7baad375..7af2a1bf7 100644
--- a/src/libutil/args.cc
+++ b/src/libutil/args.cc
@@ -178,19 +178,6 @@ Strings argvToStrings(int argc, char * * argv)
     return args;
 }
 
-Strings editorFor(Pos pos)
-{
-    auto editor = getEnv("EDITOR", "cat");
-    auto args = tokenizeString<Strings>(editor);
-    if (pos.line > 0 && (
-        editor.find("emacs") != std::string::npos ||
-        editor.find("nano") != std::string::npos ||
-        editor.find("vim") != std::string::npos))
-        args.push_back(fmt("+%d", pos.line));
-    args.push_back(pos.file);
-    return args;
-}
-
 std::string renderLabels(const Strings & labels)
 {
     std::string res;
diff --git a/src/libutil/args.hh b/src/libutil/args.hh
index 1e29bd4fa..ad5fcca39 100644
--- a/src/libutil/args.hh
+++ b/src/libutil/args.hh
@@ -5,7 +5,6 @@
 #include <memory>
 
 #include "util.hh"
-#include "nixexpr.hh"
 
 namespace nix {
 
@@ -191,9 +190,6 @@ public:
 
 Strings argvToStrings(int argc, char * * argv);
 
-/* Helper function to generate args that invoke $EDITOR on filename:lineno */
-Strings editorFor(Pos pos);
-
 /* Helper function for rendering argument labels. */
 std::string renderLabels(const Strings & labels);
 
diff --git a/src/nix/command.cc b/src/nix/command.cc
index 532f331a7..97c2fcf1c 100644
--- a/src/nix/command.cc
+++ b/src/nix/command.cc
@@ -1,6 +1,7 @@
 #include "command.hh"
 #include "store-api.hh"
 #include "derivations.hh"
+#include "nixexpr.hh"
 
 namespace nix {
 
@@ -153,4 +154,17 @@ void StorePathCommand::run(ref<Store> store)
     run(store, *storePaths.begin());
 }
 
+Strings editorFor(const Pos & pos)
+{
+    auto editor = getEnv("EDITOR", "cat");
+    auto args = tokenizeString<Strings>(editor);
+    if (pos.line > 0 && (
+        editor.find("emacs") != std::string::npos ||
+        editor.find("nano") != std::string::npos ||
+        editor.find("vim") != std::string::npos))
+        args.push_back(fmt("+%d", pos.line));
+    args.push_back(pos.file);
+    return args;
+}
+
 }
diff --git a/src/nix/command.hh b/src/nix/command.hh
index fad404c73..26c15e646 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -10,6 +10,7 @@ extern std::string programPath;
 struct Value;
 class Bindings;
 class EvalState;
+struct Pos;
 
 /* A command is an argument parser that can be executed by calling its
    run() method. */
@@ -216,4 +217,8 @@ PathSet toDerivations(ref<Store> store,
     std::vector<std::shared_ptr<Installable>> installables,
     bool useDeriver = false);
 
+/* Helper function to generate args that invoke $EDITOR on
+   filename:lineno. */
+Strings editorFor(const Pos & pos);
+
 }