diff --git a/Makefile b/Makefile
index e46b3ff..9b1b802 100644
--- a/Makefile
+++ b/Makefile
@@ -114,7 +114,7 @@ tst-independent-alloc$(T_SUF): tst-independent-alloc.c $(LIB_MALLOC)
 posix:
 	$(MAKE) THR_FLAGS='-DUSE_TSD_DATA_HACK -D_REENTRANT' \
  OPT_FLAGS='$(OPT_FLAGS)' SYS_FLAGS='$(SYS_FLAGS)' CC='$(CC)' \
- INC_FLAGS='-Isysdeps/pthread -Isysdeps/generic -I.'
+ INC_FLAGS='-Isysdeps/pthread -Isysdeps/generic -I.'\
  THR_LIBS=-lpthread
 
 # posix threads with explicit initialization.  Known to be needed on HPUX.