diff --git a/Libraries/MiKTeX/Core/Session/unx/unxStartupConfig.cpp b/Libraries/MiKTeX/Core/Session/unx/unxStartupConfig.cpp
index 1728e7af9..727c36d8c 100644
--- a/Libraries/MiKTeX/Core/Session/unx/unxStartupConfig.cpp
+++ b/Libraries/MiKTeX/Core/Session/unx/unxStartupConfig.cpp
@@ -90,6 +90,10 @@ InternalStartupConfig SessionImpl::DefaultConfig(MiKTeXConfiguration config, Ver
   {
     pos = n - 2;
   }
+  else if (n > 3 && splittedPrefix[1] == "nix" && splittedPrefix[2] == "store")
+  {
+    pos = 1;
+  }
   if (pos < n)
   {
     PathName destdir;
@@ -98,10 +102,10 @@ InternalStartupConfig SessionImpl::DefaultConfig(MiKTeXConfiguration config, Ver
       destdir /= splittedPrefix[i];
     }
     MIKTEX_ASSERT(MIKTEX_SYSTEM_VAR_LIB_DIR[0] == '/');
-    ret.commonConfigRoot = destdir / (MIKTEX_SYSTEM_VAR_LIB_DIR + 1) / MIKTEX_PREFIX "texmf";
+    ret.commonConfigRoot = destdir / (MIKTEX_SYSTEM_VAR_LIB_DIR + 1) / MIKTEX_PREFIX "texmf" / "config";
     MIKTEX_ASSERT(MIKTEX_SYSTEM_VAR_CACHE_DIR[0] == '/');
     ret.commonDataRoot = destdir / (MIKTEX_SYSTEM_VAR_CACHE_DIR + 1) / MIKTEX_PREFIX "texmf";
-    ret.commonInstallRoot = destdir / "usr" / "local" / MIKTEX_INSTALL_DIR;
+    ret.commonInstallRoot = destdir / (MIKTEX_SYSTEM_VAR_LIB_DIR + 1) / MIKTEX_PREFIX "texmf" / "install";
   }
 #endif
   if (ret.commonConfigRoot.Empty())
@@ -124,9 +128,9 @@ InternalStartupConfig SessionImpl::DefaultConfig(MiKTeXConfiguration config, Ver
 
   PathName myLoc = GetMyLocation(true);
 #if defined(MIKTEX_MACOS_BUNDLE)
-  ret.isSharedSetup = Utils::IsParentDirectoryOf(PathName("/usr"), myLoc) || Utils::IsParentDirectoryOf(PathName("/Applications"), myLoc) ? TriState::True : TriState::False;
+  ret.isSharedSetup = Utils::IsParentDirectoryOf(PathName("/nix/store"), myLoc) || Utils::IsParentDirectoryOf(PathName("/usr"), myLoc) || Utils::IsParentDirectoryOf(PathName("/Applications"), myLoc) ? TriState::True : TriState::False;
 #else
-  ret.isSharedSetup = Utils::IsParentDirectoryOf(PathName("/usr"), myLoc) || Utils::IsParentDirectoryOf(PathName("/opt"), myLoc) ? TriState::True : TriState::False;
+  ret.isSharedSetup = Utils::IsParentDirectoryOf(PathName("/nix/store"), myLoc) || Utils::IsParentDirectoryOf(PathName("/usr"), myLoc) || Utils::IsParentDirectoryOf(PathName("/opt"), myLoc) ? TriState::True : TriState::False;
 #endif
 
   return ret;