diff --git a/WPrefs.app/Makefile.am b/WPrefs.app/Makefile.am
index c1424262..f77ddd4a 100644
--- a/WPrefs.app/Makefile.am
+++ b/WPrefs.app/Makefile.am
@@ -57,5 +57,6 @@ WPrefs_LDADD = \
 	$(top_builddir)/WINGs/libWUtil.la\
 	$(top_builddir)/wrlib/libwraster.la \
 	@XLFLAGS@ @XLIBS@ \
+	@LIBM@ \
 	@FCLIBS@ \
 	@INTLIBS@