diff --git a/package/jansson/jansson.mk b/package/jansson/jansson.mk
index 6ead0ec10c..d51e7097cd 100644
--- a/package/jansson/jansson.mk
+++ b/package/jansson/jansson.mk
@@ -9,5 +9,6 @@ JANSSON_SITE = http://www.digip.org/jansson/releases
 JANSSON_LICENSE = MIT
 JANSSON_LICENSE_FILES = LICENSE
 JANSSON_INSTALL_STAGING = YES
+JANSSON_CONF_ENV = LIBS="-lm"
 
 $(eval $(autotools-package))