diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
index e8c1f8490342a..990d2fadaf5aa 100644
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -1667,8 +1667,12 @@ Sema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch,
         // Don't warn about omitted unavailable EnumConstantDecls.
         switch (EI->second->getAvailability()) {
         case AR_Deprecated:
-          // Omitting a deprecated constant is ok; it should never materialize.
+          // Deprecated enumerators still need to be handled: they may be
+          // deprecated, but can still occur.
+          break;
+
         case AR_Unavailable:
+          // Omitting an unavailable enumerator is ok; it should never occur.
           continue;
 
         case AR_NotYetIntroduced:
diff --git a/clang/test/Sema/switch-availability.c b/clang/test/Sema/switch-availability.c
index 888edddac463d..fc44375fc83a0 100644
--- a/clang/test/Sema/switch-availability.c
+++ b/clang/test/Sema/switch-availability.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -verify -Wswitch -triple x86_64-apple-macosx10.12 %s
+// RUN: %clang_cc1 -verify -Wswitch -Wreturn-type -triple x86_64-apple-macosx10.12 %s
 
 enum SwitchOne {
   Unavail __attribute__((availability(macos, unavailable))),
@@ -15,7 +15,7 @@ enum SwitchTwo {
 };
 
 void testSwitchTwo(enum SwitchTwo st) {
-  switch (st) {} // expected-warning{{enumeration values 'Vim' and 'Emacs' not handled in switch}}
+  switch (st) {} // expected-warning{{enumeration values 'Ed', 'Vim', and 'Emacs' not handled in switch}}
 }
 
 enum SwitchThree {
@@ -25,3 +25,16 @@ enum SwitchThree {
 void testSwitchThree(enum SwitchThree st) {
   switch (st) {} // expected-warning{{enumeration value 'New' not handled in switch}}
 }
+
+enum SwitchFour {
+  Red,
+  Green,
+  Blue [[deprecated]]
+};
+
+int testSwitchFour(enum SwitchFour e) {
+  switch (e) { // expected-warning{{enumeration value 'Blue' not handled in switch}}
+  case Red:   return 1;
+  case Green: return 2;
+  }
+} // expected-warning{{non-void function does not return a value in all control paths}}