diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index 54ada1a5d4..9daa447bef 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -326,10 +326,10 @@ declare namespace NodeJS {
         getLineNumber: Function; // if this function was defined in a script returns the current line number
         getColumnNumber: Function; // if this function was defined in a script returns the current column number
         getEvalOrigin: Function; // if this function was created using a call to eval returns a CallSite object representing the location where eval was called
-        isToplevel: boolean; // is this a toplevel invocation, that is, is this the global object?
-        isEval: boolean; // does this call take place in code defined by a call to eval?
-        isNative: boolean; // is this call in native V8 code?
-        isConstructor: boolean; // is this a constructor call?
+        isToplevel: Function; // is this a toplevel invocation, that is, is this the global object?
+        isEval: Function; // does this call take place in code defined by a call to eval?
+        isNative: Function; // is this call in native V8 code?
+        isConstructor: Function; // is this a constructor call?
     }
 
     export interface ErrnoException extends Error {
diff --git a/types/node/v4/index.d.ts b/types/node/v4/index.d.ts
index 3959bd2d33..55d1b55376 100644
--- a/types/node/v4/index.d.ts
+++ b/types/node/v4/index.d.ts
@@ -244,10 +244,10 @@ declare namespace NodeJS {
         getLineNumber: Function; // if this function was defined in a script returns the current line number
         getColumnNumber: Function; // if this function was defined in a script returns the current column number
         getEvalOrigin: Function; // if this function was created using a call to eval returns a CallSite object representing the location where eval was called
-        isToplevel: boolean; // is this a toplevel invocation, that is, is this the global object?
-        isEval: boolean; // does this call take place in code defined by a call to eval?
-        isNative: boolean; // is this call in native V8 code?
-        isConstructor: boolean; // is this a constructor call?
+        isToplevel: Function; // is this a toplevel invocation, that is, is this the global object?
+        isEval: Function; // does this call take place in code defined by a call to eval?
+        isNative: Function; // is this call in native V8 code?
+        isConstructor: Function; // is this a constructor call?
     }
 
     export interface ErrnoException extends Error {
diff --git a/types/node/v6/index.d.ts b/types/node/v6/index.d.ts
index 0b36f2cc7b..54a77a4044 100644
--- a/types/node/v6/index.d.ts
+++ b/types/node/v6/index.d.ts
@@ -273,10 +273,10 @@ declare namespace NodeJS {
         getLineNumber: Function; // if this function was defined in a script returns the current line number
         getColumnNumber: Function; // if this function was defined in a script returns the current column number
         getEvalOrigin: Function; // if this function was created using a call to eval returns a CallSite object representing the location where eval was called
-        isToplevel: boolean; // is this a toplevel invocation, that is, is this the global object?
-        isEval: boolean; // does this call take place in code defined by a call to eval?
-        isNative: boolean; // is this call in native V8 code?
-        isConstructor: boolean; // is this a constructor call?
+        isToplevel: Function; // is this a toplevel invocation, that is, is this the global object?
+        isEval: Function; // does this call take place in code defined by a call to eval?
+        isNative: Function; // is this call in native V8 code?
+        isConstructor: Function; // is this a constructor call?
     }
 
     export interface ErrnoException extends Error {
diff --git a/types/node/v7/index.d.ts b/types/node/v7/index.d.ts
index 55bbe84bd8..4bf98adf5e 100644
--- a/types/node/v7/index.d.ts
+++ b/types/node/v7/index.d.ts
@@ -285,10 +285,10 @@ declare namespace NodeJS {
         getLineNumber: Function; // if this function was defined in a script returns the current line number
         getColumnNumber: Function; // if this function was defined in a script returns the current column number
         getEvalOrigin: Function; // if this function was created using a call to eval returns a CallSite object representing the location where eval was called
-        isToplevel: boolean; // is this a toplevel invocation, that is, is this the global object?
-        isEval: boolean; // does this call take place in code defined by a call to eval?
-        isNative: boolean; // is this call in native V8 code?
-        isConstructor: boolean; // is this a constructor call?
+        isToplevel: Function; // is this a toplevel invocation, that is, is this the global object?
+        isEval: Function; // does this call take place in code defined by a call to eval?
+        isNative: Function; // is this call in native V8 code?
+        isConstructor: Function; // is this a constructor call?
     }
 
     export interface ErrnoException extends Error {