diff --git a/compiler/utils/assembler_thumb_test.cc b/compiler/utils/assembler_thumb_test.cc
index 772fa9a..7738627 100644
--- a/compiler/utils/assembler_thumb_test.cc
+++ b/compiler/utils/assembler_thumb_test.cc
@@ -15,9 +15,11 @@
  */
 
 #include <dirent.h>
+#include <errno.h>
 #include <fstream>
-#include <sys/types.h>
 #include <map>
+#include <string.h>
+#include <sys/types.h>
 
 #include "gtest/gtest.h"
 #include "utils/arm/assembler_thumb2.h"
@@ -105,12 +107,14 @@
 
   // Assemble the .S
   snprintf(cmd, sizeof(cmd), "%sas %s -o %s.o", toolsdir.c_str(), filename, filename);
-  system(cmd);
+  int cmd_result = system(cmd);
+  ASSERT_EQ(cmd_result, 0) << strerror(errno);
 
   // Remove the $d symbols to prevent the disassembler dumping the instructions
   // as .word
   snprintf(cmd, sizeof(cmd), "%sobjcopy -N '$d' %s.o %s.oo", toolsdir.c_str(), filename, filename);
-  system(cmd);
+  int cmd_result2 = system(cmd);
+  ASSERT_EQ(cmd_result2, 0) << strerror(errno);
 
   // Disassemble.
 
@@ -119,7 +123,8 @@
   if (kPrintResults) {
     // Print the results only, don't check. This is used to generate new output for inserting
     // into the .inc file.
-    system(cmd);
+    int cmd_result3 = system(cmd);
+    ASSERT_EQ(cmd_result3, 0) << strerror(errno);
   } else {
     // Check the results match the appropriate results in the .inc file.
     FILE *fp = popen(cmd, "r");