diff --git a/01.w_Defects/Makefile.am b/01.w_Defects/Makefile.am
index 4399e94..8b553d9 100644
--- a/01.w_Defects/Makefile.am
+++ b/01.w_Defects/Makefile.am
@@ -1,6 +1,7 @@
 AM_CPPFLAGS = -I$(top_srcdir)/include
 AM_CFLAGS = -pthread
 AM_LDFLAGS = -lm
+LDADD = -lm
 bin_PROGRAMS = 01_w_Defects
 01_w_Defects_SOURCES = \
 HeaderFile.h \
diff --git a/02.wo_Defects/Makefile.am b/02.wo_Defects/Makefile.am
index ae07312..699e24a 100644
--- a/02.wo_Defects/Makefile.am
+++ b/02.wo_Defects/Makefile.am
@@ -1,6 +1,7 @@
 AM_CPPFLAGS = -I$(top_srcdir)/include
 AM_CFLAGS = -pthread
 AM_LDFLAGS = -lm
+LDADD = -lm
 bin_PROGRAMS = 02_wo_Defects
 02_wo_Defects_SOURCES = \
 bit_shift.c				lock_never_unlock.c \