diff --git a/Makefile.am b/Makefile.am
index aa1affb..8e3d86f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 AM_CPPFLAGS          =
 AM_CFLAGS            = -g -std=gnu99 -Wall
-AM_LDFLAGS           = -g
+AM_LDFLAGS           = -g -lm
 
 OBJCOPY             ?= objcopy
 OBJDUMP             ?= objdump
diff --git a/Makefile.in b/Makefile.in
index 9a797fd..b9f58cc 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -259,7 +259,7 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 AM_CPPFLAGS = 
 AM_CFLAGS = -g -std=gnu99 -Wall
-AM_LDFLAGS = -g
+AM_LDFLAGS = -g -lm
 noinst_LTLIBRARIES = libhttp.la                                             \
                        liblogging.la