diff --git a/tools/install/win/lazarus-cross.iss b/tools/install/win/lazarus-cross.iss
index 834cbda8a7..0a39e8e3a2 100644
--- a/tools/install/win/lazarus-cross.iss
+++ b/tools/install/win/lazarus-cross.iss
@@ -27,7 +27,7 @@ AppPublisherURL=http://www.lazarus.freepascal.org/
 AppSupportURL=http://www.lazarus.freepascal.org/
 AppUpdatesURL=http://www.lazarus.freepascal.org/
 ArchitecturesInstallIn64BitMode=x64
-DefaultDirName={code:GetDefDir|c:\lazarus}
+DefaultDirName={code:GetDefDir|{sd}\lazarus}
 DefaultGroupName={#AppName}
 InternalCompressLevel=ultra
 OutputBaseFilename={#OutputFileName}
diff --git a/tools/install/win/lazarus.iss b/tools/install/win/lazarus.iss
index 80570442dc..c719c2b1b3 100644
--- a/tools/install/win/lazarus.iss
+++ b/tools/install/win/lazarus.iss
@@ -27,7 +27,7 @@ AppPublisherURL=http://www.lazarus.freepascal.org/
 AppSupportURL=http://www.lazarus.freepascal.org/
 AppUpdatesURL=http://www.lazarus.freepascal.org/
 ArchitecturesInstallIn64BitMode=x64
-DefaultDirName={code:GetDefDir|c:\lazarus}
+DefaultDirName={code:GetDefDir|{sd}\lazarus}
 DefaultGroupName={#AppName}
 OutputBaseFilename={#OutputFileName}
 InternalCompressLevel=ultra