diff --git a/src/libstore/path.cc b/src/libstore/path.cc
index 70b919adc..9a28aa96a 100644
--- a/src/libstore/path.cc
+++ b/src/libstore/path.cc
@@ -64,7 +64,7 @@ std::optional<StorePath> Store::maybeParseStorePath(std::string_view path) const
     }
 }
 
-bool Store::isStorePath(const Path & path) const
+bool Store::isStorePath(std::string_view path) const
 {
     return (bool) maybeParseStorePath(path);
 }
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index a1cfb314a..a000757fb 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -305,7 +305,7 @@ public:
 
     /* Return true if ‘path’ is a store path, i.e. a direct child of
        the Nix store. */
-    bool isStorePath(const Path & path) const;
+    bool isStorePath(std::string_view path) const;
 
     /* Chop off the parts after the top-level store name, e.g.,
        /nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
diff --git a/src/nix-build/nix-build.cc b/src/nix-build/nix-build.cc
index ff95ad787..27ec7d0fe 100755
--- a/src/nix-build/nix-build.cc
+++ b/src/nix-build/nix-build.cc
@@ -295,7 +295,8 @@ static void _main(int argc, char * * argv)
                 try {
                     absolute = canonPath(absPath(i), true);
                 } catch (Error & e) {};
-                if (store->isStorePath(absolute) && std::regex_match(absolute, std::regex(".*\\.drv(!.*)?")))
+                auto [path, outputNames] = parsePathWithOutputs(absolute);
+                if (store->isStorePath(path) && hasSuffix(path, ".drv"))
                     drvs.push_back(DrvInfo(*state, store, absolute));
                 else
                     /* If we're in a #! script, interpret filenames