diff --git a/include/llvm/Support/Debug.h b/include/llvm/Support/Debug.h
index 274c1a94a1e..896fe849a6b 100644
--- a/include/llvm/Support/Debug.h
+++ b/include/llvm/Support/Debug.h
@@ -19,7 +19,7 @@
 // foo class.
 //
 // When compiling without assertions, the -debug-* options and all code in
-// DEBUG() statements disappear, so it does not effect the runtime of the code.
+// DEBUG() statements disappears, so it does not affect the runtime of the code.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Support/Debug.cpp b/lib/Support/Debug.cpp
index fa2dd888d16..c8e8900749b 100644
--- a/lib/Support/Debug.cpp
+++ b/lib/Support/Debug.cpp
@@ -19,7 +19,7 @@
 // foo class.
 //
 // When compiling without assertions, the -debug-* options and all code in
-// DEBUG() statements disappear, so it does not effect the runtime of the code.
+// DEBUG() statements disappears, so it does not affect the runtime of the code.
 //
 //===----------------------------------------------------------------------===//