diff --git a/src/libfetchers/fetchers.cc b/src/libfetchers/fetchers.cc
index 1cfc48d52..9459db087 100644
--- a/src/libfetchers/fetchers.cc
+++ b/src/libfetchers/fetchers.cc
@@ -358,7 +358,7 @@ void Input::clone(const Path & destDir) const
     scheme->clone(*this, destDir);
 }
 
-std::optional<Path> Input::getSourcePath() const
+std::optional<std::filesystem::path> Input::getSourcePath() const
 {
     assert(scheme);
     return scheme->getSourcePath(*this);
@@ -461,7 +461,7 @@ Input InputScheme::applyOverrides(
     return input;
 }
 
-std::optional<Path> InputScheme::getSourcePath(const Input & input) const
+std::optional<std::filesystem::path> InputScheme::getSourcePath(const Input & input) const
 {
     return {};
 }
diff --git a/src/libfetchers/fetchers.hh b/src/libfetchers/fetchers.hh
index 87c7b08c0..644c267c1 100644
--- a/src/libfetchers/fetchers.hh
+++ b/src/libfetchers/fetchers.hh
@@ -164,7 +164,7 @@ public:
 
     void clone(const Path & destDir) const;
 
-    std::optional<Path> getSourcePath() const;
+    std::optional<std::filesystem::path> getSourcePath() const;
 
     /**
      * Write a file to this input, for input types that support
@@ -247,7 +247,7 @@ struct InputScheme
 
     virtual void clone(const Input & input, const Path & destDir) const;
 
-    virtual std::optional<Path> getSourcePath(const Input & input) const;
+    virtual std::optional<std::filesystem::path> getSourcePath(const Input & input) const;
 
     virtual void putFile(
         const Input & input,
diff --git a/src/libfetchers/git.cc b/src/libfetchers/git.cc
index bca4b2d38..4523f49ca 100644
--- a/src/libfetchers/git.cc
+++ b/src/libfetchers/git.cc
@@ -311,14 +311,9 @@ struct GitInputScheme : InputScheme
         runProgram("git", true, args, {}, true);
     }
 
-    // FIXME: return std::filesystem::path
-    std::optional<Path> getSourcePath(const Input & input) const override
+    std::optional<std::filesystem::path> getSourcePath(const Input & input) const override
     {
-        auto repoInfo = getRepoInfo(input);
-        if (auto path = repoInfo.getPath())
-            return *path;
-        else
-            return std::nullopt;
+        return getRepoInfo(input).getPath();
     }
 
     void putFile(
diff --git a/src/libfetchers/mercurial.cc b/src/libfetchers/mercurial.cc
index c2fd8139c..61cbca202 100644
--- a/src/libfetchers/mercurial.cc
+++ b/src/libfetchers/mercurial.cc
@@ -126,7 +126,7 @@ struct MercurialInputScheme : InputScheme
         return res;
     }
 
-    std::optional<Path> getSourcePath(const Input & input) const override
+    std::optional<std::filesystem::path> getSourcePath(const Input & input) const override
     {
         auto url = parseURL(getStrAttr(input.attrs, "url"));
         if (url.scheme == "file" && !input.getRef() && !input.getRev())
diff --git a/src/libfetchers/path.cc b/src/libfetchers/path.cc
index 351e21a1b..9d1cce0f3 100644
--- a/src/libfetchers/path.cc
+++ b/src/libfetchers/path.cc
@@ -80,9 +80,9 @@ struct PathInputScheme : InputScheme
         };
     }
 
-    std::optional<Path> getSourcePath(const Input & input) const override
+    std::optional<std::filesystem::path> getSourcePath(const Input & input) const override
     {
-        return getStrAttr(input.attrs, "path");
+        return getAbsPath(input);
     }
 
     void putFile(
diff --git a/src/libflake/flake/flake.cc b/src/libflake/flake/flake.cc
index 873a26d5c..c2145ab39 100644
--- a/src/libflake/flake/flake.cc
+++ b/src/libflake/flake/flake.cc
@@ -781,7 +781,7 @@ LockedFlake lockFlake(
                             writeFile(*lockFlags.outputLockFilePath, newLockFileS);
                         } else {
                             auto relPath = (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock";
-                            auto outputLockFilePath = *sourcePath + "/" + relPath;
+                            auto outputLockFilePath = *sourcePath / relPath;
 
                             bool lockFileExists = pathExists(outputLockFilePath);
 
diff --git a/src/nix/develop.cc b/src/nix/develop.cc
index 1736add9a..deee89aa1 100644
--- a/src/nix/develop.cc
+++ b/src/nix/develop.cc
@@ -696,7 +696,7 @@ struct CmdDevelop : Common, MixEnvironment
                 auto sourcePath = installableFlake->getLockedFlake()->flake.resolvedRef.input.getSourcePath();
                 if (sourcePath) {
                     if (chdir(sourcePath->c_str()) == -1) {
-                        throw SysError("chdir to '%s' failed", *sourcePath);
+                        throw SysError("chdir to %s failed", *sourcePath);
                     }
                 }
             }