diff --git a/Libraries/LibM/Makefile b/Libraries/LibM/Makefile
index b6c619b47d..c5d2716cfd 100644
--- a/Libraries/LibM/Makefile
+++ b/Libraries/LibM/Makefile
@@ -2,6 +2,8 @@ OBJS = math.o
 
 LIBRARY = libm.a
 
+POST_LIBRARY_BUILD = $(QUIET) $(MAKE) install
+
 install:
 	mkdir -p $(SERENITY_BASE_DIR)/Root/usr/include/sys/
 	mkdir -p $(SERENITY_BASE_DIR)/Root/usr/lib/