diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 0dd84d2..5da5288 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -516,6 +516,9 @@
 def err_use_continuation_class : Error<
   "illegal redeclaration of property in continuation class %0"
   " (attribute must be 'readwrite', while its primary must be 'readonly')">;
+def error_type_mismatch_continuation_class : Error<
+  "type of property %0 in continuation class does not match"
+  "property type in primary class">;
 def err_use_continuation_class_redeclaration_readwrite : Error<
   "illegal redeclaration of 'readwrite' property in continuation class %0"
   " (perhaps you intended this to be a 'readwrite' redeclaration of a "
diff --git a/lib/Sema/SemaObjCProperty.cpp b/lib/Sema/SemaObjCProperty.cpp
index 2bb5456..6284f36 100644
--- a/lib/Sema/SemaObjCProperty.cpp
+++ b/lib/Sema/SemaObjCProperty.cpp
@@ -235,7 +235,13 @@
                         /* lexicalDC = */ CDecl);
     return PDecl;
   }
-
+  if (PIDecl->getType().getCanonicalType() 
+      != PDecl->getType().getCanonicalType()) {
+    Diag(AtLoc, 
+         diag::error_type_mismatch_continuation_class) << PDecl->getType();
+    Diag(PIDecl->getLocation(), diag::note_property_declare);
+  }
+    
   // The property 'PIDecl's readonly attribute will be over-ridden
   // with continuation class's readwrite property attribute!
   unsigned PIkind = PIDecl->getPropertyAttributesAsWritten();
diff --git a/test/SemaObjC/continuation-class-property.m b/test/SemaObjC/continuation-class-property.m
index c48a23d..e398ae5 100644
--- a/test/SemaObjC/continuation-class-property.m
+++ b/test/SemaObjC/continuation-class-property.m
@@ -22,3 +22,22 @@
 @property (readwrite, copy) id foos;
 @end
 
+
+// rdar://10142679
+@class NSString;
+
+typedef struct {
+  float width;
+  float length;
+} NSRect;
+
+@interface MyClass  {
+}
+@property (readonly) NSRect foo; // expected-note {{property declared here}}
+@property (readonly, strong) NSString *bar; // expected-note {{property declared here}}
+@end
+
+@interface MyClass ()
+@property (readwrite) NSString *foo; // expected-error {{type of property 'NSString *' in continuation class does not matchproperty type in primary class}}
+@property (readwrite, strong) NSRect bar; // expected-error {{type of property 'NSRect' in continuation class does not matchproperty type in primary class}}
+@end
diff --git a/test/SemaObjCXX/property-synthesis-error.mm b/test/SemaObjCXX/property-synthesis-error.mm
index c7a279c..c67f0a4 100644
--- a/test/SemaObjCXX/property-synthesis-error.mm
+++ b/test/SemaObjCXX/property-synthesis-error.mm
@@ -10,7 +10,7 @@
   NSMutableArray * _array;
 }
 
-@property (readonly) NSArray * array;
+@property (readonly) NSMutableArray * array;
 
 @end