diff --git a/pineapple-pictures.pro b/pineapple-pictures.pro
index 384139e..8f0ddf5 100644
--- a/pineapple-pictures.pro
+++ b/pineapple-pictures.pro
@@ -9,6 +9,10 @@ TARGET = ppic
 TEMPLATE = app
 DEFINES += PPIC_VERSION_STRING=\\\"x.y.z\\\"
 
+win32 {
+    DEFINES += FLAG_PORTABLE_MODE_SUPPORT=1
+}
+
 # The following define makes your compiler emit warnings if you use
 # any feature of Qt which has been marked as deprecated (the exact warnings
 # depend on your compiler). Please consult the documentation of the