diff --git a/cups-filters/Makefile.am b/cups-filters/Makefile.am
index bf680e1..2a2b6fb 100644
--- a/cups-filters/Makefile.am
+++ b/cups-filters/Makefile.am
@@ -456,6 +456,7 @@ imagetopdf_CFLAGS = \
 	$(TIFF_CFLAGS) \
 	-I$(srcdir)/cupsfilters/
 imagetopdf_LDADD = \
+	-lm \
 	$(CUPS_LIBS) \
 	$(LIBJPEG_LIBS) \
 	$(LIBPNG_LIBS) \
@@ -472,6 +473,7 @@ imagetoraster_CFLAGS = \
 	$(CUPS_CFLAGS) \
 	-I$(srcdir)/cupsfilters/
 imagetoraster_LDADD = \
+	-lm \
 	$(CUPS_LIBS) \
 	libcupsfilters.la