diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index ab703b3..fbc7dbd 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -15,7 +15,6 @@
                  src/generate/t_xsd_generator.cc \
                  src/generate/t_perl_generator.cc \
                  src/generate/t_erl_generator.cc \
-                 src/generate/t_csharp_generator.cc \
                  src/globals.h \
                  src/main.h \
                  src/platform.h \
@@ -53,6 +52,9 @@
 if THRIFT_GEN_java
 thrift_SOURCES += src/generate/t_java_generator.cc
 endif
+if THRIFT_GEN_csharp
+thrift_SOURCES += src/generate/t_csharp_generator.cc
+endif
 if THRIFT_GEN_cocoa
 thrift_SOURCES += src/generate/t_cocoa_generator.cc
 endif