diff --git a/win32/installer/hexchat-x64.skel.iss b/win32/installer/hexchat-x64.skel.iss
index f198487b..0f175cad 100644
--- a/win32/installer/hexchat-x64.skel.iss
+++ b/win32/installer/hexchat-x64.skel.iss
@@ -260,6 +260,7 @@ begin
 			begin
 				UnInstallOldVersion();
 			end;
+			DeleteFile(ExpandConstant('{app}\portable-mode'));
 		end;
 	end;
 end;
diff --git a/win32/installer/hexchat-x86.skel.iss b/win32/installer/hexchat-x86.skel.iss
index da7d900b..45ce964c 100644
--- a/win32/installer/hexchat-x86.skel.iss
+++ b/win32/installer/hexchat-x86.skel.iss
@@ -261,6 +261,7 @@ begin
 			begin
 				UnInstallOldVersion();
 			end;
+			DeleteFile(ExpandConstant('{app}\portable-mode'));
 		end;
 	end;
 end;