diff --git a/Makefile.in b/Makefile.in
index 82d330dff..615980fb0 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -105,7 +105,7 @@ NSE_SRC+=nse_libssh2.cc
 NSE_HDRS+=nse_libssh2.h
 NSE_OBJS+=nse_libssh2.o
 endif
-ifneq (@LIBZLIB_LIBS@,)
+ifneq (@ZLIB_LIBS@,)
 NSE_SRC+=nse_zlib.cc
 NSE_HDRS+=nse_zlib.h
 NSE_OBJS+=nse_zlib.o