diff --git a/Docs/src/var.but b/Docs/src/var.but
index 1a7eabdc..a08acf27 100644
--- a/Docs/src/var.but
+++ b/Docs/src/var.but
@@ -156,6 +156,12 @@ The application data directory. Detection of the current user path requires Inte
 
 This constant is not available on Windows 95 with Internet Explorer 4 and Active Desktop not installed.
 
+\e{$LOCALAPPDATA}
+
+The local (nonroaming) application data directory.
+
+This constant is available on Windows 2000 and above.
+
 \e{$PRINTHOOD}
 
 The directory that contains link objects that may exist in the Printers folder.
diff --git a/Source/Platform.h b/Source/Platform.h
index b88b77ce..7190ea01 100644
--- a/Source/Platform.h
+++ b/Source/Platform.h
@@ -271,6 +271,9 @@ typedef WORD LANGID;
 #ifndef CSIDL_COMMON_APPDATA
 #  define CSIDL_COMMON_APPDATA 0x23
 #endif
+#ifndef CSIDL_LOCAL_APPDATA
+#  define CSIDL_LOCAL_APPDATA 0x1C
+#endif
 #ifndef CSIDL_PRINTHOOD
 #  define CSIDL_PRINTHOOD 0x1B
 #endif
diff --git a/Source/build.cpp b/Source/build.cpp
index 00ebf792..55800279 100644
--- a/Source/build.cpp
+++ b/Source/build.cpp
@@ -445,6 +445,7 @@ definedlist.add("NSIS_SUPPORT_LANG_IN_STRINGS");
   m_ShellConstants.add("FONTS", CSIDL_FONTS, CSIDL_FONTS);
   m_ShellConstants.add("TEMPLATES", CSIDL_TEMPLATES, CSIDL_COMMON_TEMPLATES);
   m_ShellConstants.add("APPDATA", CSIDL_APPDATA, CSIDL_COMMON_APPDATA);
+  m_ShellConstants.add("LOCALAPPDATA", CSIDL_LOCAL_APPDATA, CSIDL_LOCAL_APPDATA);
   m_ShellConstants.add("PRINTHOOD", CSIDL_PRINTHOOD, CSIDL_PRINTHOOD);
   //m_ShellConstants.add("ALTSTARTUP", CSIDL_ALTSTARTUP, CSIDL_COMMON_ALTSTARTUP);
   m_ShellConstants.add("INTERNET_CACHE", CSIDL_INTERNET_CACHE, CSIDL_INTERNET_CACHE);