diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index 132462c..6b21c67 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -12,7 +12,6 @@
                  src/generate/t_generator.cc \
                  src/generate/t_php_generator.cc \
                  src/generate/t_xsd_generator.cc \
-                 src/generate/t_erl_generator.cc \
                  src/globals.h \
                  src/main.h \
                  src/platform.h \
@@ -58,6 +57,9 @@
 if THRIFT_GEN_perl
 thrift_SOURCES += src/generate/t_perl_generator.cc
 endif
+if THRIFT_GEN_erl
+thrift_SOURCES += src/generate/t_erl_generator.cc
+endif
 if THRIFT_GEN_cocoa
 thrift_SOURCES += src/generate/t_cocoa_generator.cc
 endif