diff --git a/lib/Target/SubtargetFeature.cpp b/lib/Target/SubtargetFeature.cpp
index b35190a..ba53d63 100644
--- a/lib/Target/SubtargetFeature.cpp
+++ b/lib/Target/SubtargetFeature.cpp
@@ -162,7 +162,7 @@
   
   errs() << "Use +feature to enable a feature, or -feature to disable it.\n"
        << "For example, llc -mcpu=mycpu -mattr=+feature1,-feature2\n";
-  exit(1);
+  std::exit(1);
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/TargetInstrInfo.cpp b/lib/Target/TargetInstrInfo.cpp
index eca97ab..d4986d8 100644
--- a/lib/Target/TargetInstrInfo.cpp
+++ b/lib/Target/TargetInstrInfo.cpp
@@ -164,7 +164,7 @@
   for (; *Str; ++Str) {
     if (*Str == '\n' || *Str == MAI.getSeparatorChar())
       atInsnStart = true;
-    if (atInsnStart && !isspace(*Str)) {
+    if (atInsnStart && !std::isspace(*Str)) {
       Length += MAI.getMaxInstLength();
       atInsnStart = false;
     }