diff --git a/npa/Makefile.am b/npa/Makefile.am
index a7bb3e1..5ba6630 100644
--- a/npa/Makefile.am
+++ b/npa/Makefile.am
@@ -52,7 +52,6 @@ $(opensc_root)/lib/libnpa.la: $(opensc_root)/lib/libopensc.la
 		--host=i586-mingw32msvc \
 		--build=$(shell gcc -dumpmachine) \
 		--program-prefix='' \
-		LIBS="-lws2_32" \
 		PKG_CONFIG_PATH="$(opensc_root)/lib/pkgconfig" \
 		PKG_CONFIG_SYSROOT_DIR="$(opensc_root)" \
 		OPENSC_LIBS="-L$(opensc_root)/lib -lopensc" || ($(restore_la) && false)
diff --git a/npa/src/Makefile.am b/npa/src/Makefile.am
index 0e51c3a..060d129 100644
--- a/npa/src/Makefile.am
+++ b/npa/src/Makefile.am
@@ -6,6 +6,9 @@ libnpa_la_SOURCES = sm.c scutil.c npa.c sslutil.c
 libnpa_la_LIBADD = $(OPENSSL_LIBS) $(OPENSC_LIBS)
 libnpa_la_CFLAGS = $(OPENSSL_CFLAGS)
 libnpa_la_LDFLAGS = -no-undefined
+if WIN32
+libnpa_la_LIBADD += -lws2_32
+endif
 
 npa_tool_SOURCES = npa-tool.c binutil.c
 npa_tool_LDADD = $(OPENSSL_LIBS) $(OPENSC_LIBS) libnpa.la