diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 807a2845e..4d4a4e9f1 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -320,7 +320,7 @@ ADD_DEPENDENCIES(dfhack-version git-describe)
 ADD_LIBRARY(dfhack SHARED ${PROJECT_SOURCES})
 ADD_DEPENDENCIES(dfhack generate_headers generate_proto_core)
 
-ADD_LIBRARY(dfhack-client SHARED RemoteClient.cpp ColorText.cpp MiscUtils.cpp ${PROJECT_PROTO_SRCS})
+ADD_LIBRARY(dfhack-client SHARED RemoteClient.cpp ColorText.cpp MiscUtils.cpp Error.cpp ${PROJECT_PROTO_SRCS})
 ADD_DEPENDENCIES(dfhack-client dfhack)
 
 ADD_EXECUTABLE(dfhack-run dfhack-run.cpp)