diff --git a/commands/bzip2-1.0.3/Makefile b/commands/bzip2-1.0.3/Makefile
index 3da5a04c1..a9790f293 100644
--- a/commands/bzip2-1.0.3/Makefile
+++ b/commands/bzip2-1.0.3/Makefile
@@ -9,7 +9,7 @@ RANLIB=ranlib
 LDFLAGS=
 
 BIGFILES=#-D_FILE_OFFSET_BITS=64
-CFLAGS=-Wall -Winline -O -g $(BIGFILES) -Dlstat=stat
+CFLAGS=-Wall -Winline -O -g $(BIGFILES) -Dlstat=stat -D_POSIX_SOURCE=1
 
 # Where you want it installed when you do 'make install'
 PREFIX=/usr/local