diff --git a/dgclock/Makefile b/dgclock/Makefile
index 2462982..1d37d6b 100644
--- a/dgclock/Makefile
+++ b/dgclock/Makefile
@@ -26,7 +26,7 @@ TARGET_CFLAGS += \
 
 TARGET_LDFLAGS += \
 	-Wl,-rpath-link=$(STAGING_DIR)/usr/lib \
-	-lSDL -lSDL_ttf
+	-lSDL -lSDL_ttf -lm
 
 define Package/dgclock
   SECTION:=xorg-apps