diff --git a/Makefile b/Makefile
index 359585f..13ec279 100644
--- a/Makefile
+++ b/Makefile
@@ -49,7 +49,6 @@ OBJS=		src/fastmap.o src/bwtindex.o src/utils.o src/memcpy_bwamem.o src/kthread.
 			src/FMI_search.o src/read_index_ele.o src/bwamem_pair.o src/kswv.o src/bwa.o \
 			src/bwamem_extra.o src/kopen.o
 BWA_LIB=    libbwa.a
-SAFE_STR_LIB=    ext/safestringlib/libsafestring.a
 
 ifeq ($(arch),sse41)
 	ifeq ($(CXX), icpc)
@@ -101,16 +100,6 @@ CXXFLAGS+=	-g -O3 -fpermissive $(ARCH_FLAGS) #-Wall ##-xSSE2
 all:$(EXE)
 
 multi:
-	rm -f src/*.o $(BWA_LIB); cd ext/safestringlib/ && $(MAKE) clean;
-	$(MAKE) arch=sse41    EXE=bwa-mem2.sse41    CXX=$(CXX) all
-	rm -f src/*.o $(BWA_LIB); cd ext/safestringlib/ && $(MAKE) clean;
-	$(MAKE) arch=sse42    EXE=bwa-mem2.sse42    CXX=$(CXX) all
-	rm -f src/*.o $(BWA_LIB); cd ext/safestringlib/ && $(MAKE) clean;
-	$(MAKE) arch=avx    EXE=bwa-mem2.avx    CXX=$(CXX) all
-	rm -f src/*.o $(BWA_LIB); cd ext/safestringlib/ && $(MAKE) clean;
-	$(MAKE) arch=avx2   EXE=bwa-mem2.avx2     CXX=$(CXX) all
-	rm -f src/*.o $(BWA_LIB); cd ext/safestringlib/ && $(MAKE) clean;
-	$(MAKE) arch=avx512 EXE=bwa-mem2.avx512bw CXX=$(CXX) all
 	$(CXX) -Wall -O3 src/runsimd.cpp -Iext/safestringlib/include -Lext/safestringlib/ -lsafestring $(STATIC_GCC) -o bwa-mem2
 
 
@@ -120,12 +109,8 @@ $(EXE):$(BWA_LIB) $(SAFE_STR_LIB) src/main.o
 $(BWA_LIB):$(OBJS)
 	ar rcs $(BWA_LIB) $(OBJS)
 
-$(SAFE_STR_LIB):
-	cd ext/safestringlib/ && $(MAKE) clean && $(MAKE) CC=$(CC) directories libsafestring.a
-
 clean:
 	rm -fr src/*.o $(BWA_LIB) $(EXE) bwa-mem2.sse41 bwa-mem2.sse42 bwa-mem2.avx bwa-mem2.avx2 bwa-mem2.avx512bw
-	cd ext/safestringlib/ && $(MAKE) clean
 
 depend:
 	(LC_ALL=C; export LC_ALL; makedepend -Y -- $(CXXFLAGS) $(CPPFLAGS) -I. -- src/*.cpp)