diff --git a/webkitbuilds/setup-win32.iss b/webkitbuilds/setup-win32.iss
index c099c3587..436b13a2d 100644
--- a/webkitbuilds/setup-win32.iss
+++ b/webkitbuilds/setup-win32.iss
@@ -18,7 +18,7 @@ AppSupportURL={#MyAppURL}
 AppUpdatesURL={#MyAppURL}
 DefaultDirName={pf}\{#MyAppName}
 DefaultGroupName={#MyAppName}
-OutputBaseFilename=copay-installer
+OutputBaseFilename=copay-installer-32
 Compression=lzma
 SolidCompression=yes
 
diff --git a/webkitbuilds/setup-win64.iss b/webkitbuilds/setup-win64.iss
index 4024a4cfc..4c3a4c803 100644
--- a/webkitbuilds/setup-win64.iss
+++ b/webkitbuilds/setup-win64.iss
@@ -18,7 +18,7 @@ AppSupportURL={#MyAppURL}
 AppUpdatesURL={#MyAppURL}
 DefaultDirName={pf}\{#MyAppName}
 DefaultGroupName={#MyAppName}
-OutputBaseFilename=copay-installer
+OutputBaseFilename=copay-installer-64
 Compression=lzma
 SolidCompression=yes