diff --git a/lib/Makefile.am b/lib/Makefile.am
index 73b5f6a..c8f72cf 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -20,14 +20,14 @@ libsxmp_la_LDFLAGS =
 
 libsxmp_la_LIBADD = -lpthread -lcrypto  $(OPENSSL_LIBS) 
 
-if COND_WIN32
+if !COND_WIN32
 
-libtdata_la_LDFLAGS = -no-undefined
+libsxmp_la_LDFLAGS += -no-undefined
 libsxmp_la_LIBADD += -lmman -luuid /mingw64/lib/libsexpr.a /mingw64/lib/libtdata.a 
 
 else
 libsxmp_la_LIBADD += $(LIBTDATA_LIBS) $(LIBSEXPR_LIBS) $(LIBUUID_LIBS)
-endif !COND_WIN32
+endif COND_WIN32
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libsxmp.pc