diff --git a/library/Makefile b/library/Makefile
index 7393b3c6..551eb375 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -22,7 +22,7 @@ LINKER		:= gcc
 WFLAGS		:= -Wall -Wextra -Werror=float-equal -Wuninitialized \
 	-Wunused-variable -Wdouble-promotion -pedantic -Wmissing-prototypes \
 	-Wmissing-declarations -Werror=undef
-CFLAGS		:= $(EXT_CFLAGS) -g -fPIC -I $(INCLUDEDIR)
+CFLAGS		:= $(EXT_CFLAGS) -g -fPIC -I $(INCLUDEDIR) -lm
 OPT_FLAGS	:= -O1
 LDFLAGS		:= -lm -lrt -pthread -shared -Wl,-soname,$(SONAME)