diff --git a/configure.ac b/configure.ac
index 9d71e956..935706f5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -69,7 +69,7 @@ if test "x$ac_cv_have_endian_h" = "xno"; then
   fi
 fi
 
-GLOBAL_CFLAGS="-Wno-multichar -O2"
+GLOBAL_CFLAGS="-Wno-multichar -O2 -lm"
 AC_LDADD=""
 AC_LDFLAGS=""