diff --git a/library/library.pro b/library/library.pro
index 4779cb3..d434b12 100644
--- a/library/library.pro
+++ b/library/library.pro
@@ -35,7 +35,8 @@ SOURCES += \
     src/tariff_log.cpp \
     src/calculate_price.cpp \
     src/ticket.cpp \
-    src/tariff_global_defines.cpp
+    src/tariff_global_defines.cpp \
+    src/atb_time.cpp
 
 HEADERS += \
 	include/mobilisis/calculator_functions.h \
@@ -89,7 +90,8 @@ HEADERS += \
     include/mobilisis/tariff_interpolation.h \
     include/mobilisis/tariff_prepaid.h \
     include/mobilisis/tariff_carryover.h \
-    include/mobilisis/tariff_global_defines.h
+    include/mobilisis/tariff_global_defines.h \
+    include/mobilisis/atb_time.h
 
 OTHER_FILES += src/main.cpp \
     ../tariffs/tariff_korneuburg.json \