diff --git a/library/library.pro b/library/library.pro
index e008d61..a978c03 100644
--- a/library/library.pro
+++ b/library/library.pro
@@ -84,7 +84,10 @@ HEADERS += \
     include/mobilisis/tariff_timestep_config.h \
     include/mobilisis/tariff_product.h \
     include/mobilisis/tariff_permit_type.h \
-    include/mobilisis/tariff_global_defines.h
+    include/mobilisis/tariff_global_defines.h \
+    include/mobilisis/tariff_interpolation.h \
+    include/mobilisis/tariff_prepaid.h \
+    include/mobilisis/tariff_carryover.h
 
 OTHER_FILES += src/main.cpp \
     ../tariffs/tariff_korneuburg.json \