diff --git a/compiler/utils/assembler_test_base.h b/compiler/utils/assembler_test_base.h
index 1567367..736a292 100644
--- a/compiler/utils/assembler_test_base.h
+++ b/compiler/utils/assembler_test_base.h
@@ -135,22 +135,24 @@
   }
 
   virtual std::vector<std::string> GetAssemblerCommand() {
-    switch (GetIsa()) {
+    InstructionSet isa = GetIsa();
+    switch (isa) {
       case InstructionSet::kX86:
-        return {FindTool("as"), "--32"};
+        return {FindTool("clang"), "--compile", "-target", "i386-linux-gnu"};
       case InstructionSet::kX86_64:
-        return {FindTool("as"), "--64"};
+        return {FindTool("clang"), "--compile", "-target", "x86_64-linux-gnu"};
       default:
-        return {FindTool("as")};
+        LOG(FATAL) << "Unknown instruction set: " << isa;
+        UNREACHABLE();
     }
   }
 
   virtual std::vector<std::string> GetDisassemblerCommand() {
     switch (GetIsa()) {
       case InstructionSet::kThumb2:
-        return {FindTool("objdump"), "--disassemble", "-M", "force-thumb"};
+        return {FindTool("llvm-objdump"), "--disassemble", "-triple", "thumbv7a-linux-gnueabi"};
       default:
-        return {FindTool("objdump"), "--disassemble", "--no-show-raw-insn"};
+        return {FindTool("llvm-objdump"), "--disassemble", "--no-show-raw-insn"};
     }
   }