diff --git a/Makefile.am b/Makefile.am
index 55e39a56..cc8d88af 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -100,7 +100,7 @@ SUBDIRS = \
 
 libdrm_la_LTLIBRARIES = libdrm.la
 libdrm_ladir = $(libdir)
-libdrm_la_LDFLAGS = -version-number 2:4:0 -no-undefined
+libdrm_la_LDFLAGS = -version-number 2:4:0 -no-undefined -lm
 libdrm_la_LIBADD = @CLOCK_LIB@
 
 libdrm_la_CPPFLAGS = -I$(top_srcdir)/include/drm