diff --git a/llvm/lib/Support/PrettyStackTrace.cpp b/llvm/lib/Support/PrettyStackTrace.cpp
--- a/llvm/lib/Support/PrettyStackTrace.cpp
+++ b/llvm/lib/Support/PrettyStackTrace.cpp
@@ -25,6 +25,7 @@
 #include <cassert>
 #include <cstdarg>
 #include <cstdio>
+#include <cstring>
 #include <tuple>
 
 #ifdef HAVE_CRASHREPORTERCLIENT_H
@@ -253,8 +254,16 @@
 void PrettyStackTraceProgram::print(raw_ostream &OS) const {
   OS << "Program arguments: ";
   // Print the argument list.
-  for (unsigned i = 0, e = ArgC; i != e; ++i)
-    OS << ArgV[i] << ' ';
+  for (int I = 0; I < ArgC; ++I) {
+    const bool HaveSpace = ::strchr(ArgV[I], ' ');
+    if (I)
+      OS << ' ';
+    if (HaveSpace)
+      OS << '"';
+    OS.write_escaped(ArgV[I]);
+    if (HaveSpace)
+      OS << '"';
+  }
   OS << '\n';
 }