diff --git a/clang/lib/Format/WhitespaceManager.cpp b/clang/lib/Format/WhitespaceManager.cpp
--- a/clang/lib/Format/WhitespaceManager.cpp
+++ b/clang/lib/Format/WhitespaceManager.cpp
@@ -1282,9 +1282,12 @@
                                  C.EscapedNewlineColumn);
       else
         appendNewlineText(ReplacementText, C.NewlinesBefore);
+      // FIXME: This assert should hold if we computed the column correctly.
+      // assert((int)C.StartOfTokenColumn >= C.Spaces);
       appendIndentText(
           ReplacementText, C.Tok->IndentLevel, std::max(0, C.Spaces),
-          C.StartOfTokenColumn - std::max(0, C.Spaces), C.IsAligned);
+          std::max((int)C.StartOfTokenColumn, C.Spaces) - std::max(0, C.Spaces),
+          C.IsAligned);
       ReplacementText.append(C.CurrentLinePrefix);
       storeReplacement(C.OriginalWhitespaceRange, ReplacementText);
     }
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -13452,6 +13452,25 @@
                    "}",
                    Tab));
 
+  verifyFormat("void f() {\n"
+               "\treturn true ? aaaaaaaaaaaaaaaaaa\n"
+               "\t            : bbbbbbbbbbbbbbbbbb\n"
+               "}",
+               Tab);
+  FormatStyle TabNoBreak = Tab;
+  TabNoBreak.BreakBeforeTernaryOperators = false;
+  verifyFormat("void f() {\n"
+               "\treturn true ? aaaaaaaaaaaaaaaaaa :\n"
+               "\t              bbbbbbbbbbbbbbbbbb\n"
+               "}",
+               TabNoBreak);
+  verifyFormat("void f() {\n"
+               "\treturn true ?\n"
+               "\t           aaaaaaaaaaaaaaaaaaaa :\n"
+               "\t           bbbbbbbbbbbbbbbbbbbb\n"
+               "}",
+               TabNoBreak);
+
   Tab.UseTab = FormatStyle::UT_Never;
   EXPECT_EQ("/*\n"
             "              a\t\tcomment\n"