diff --git a/js/jsd/jsd_step.c b/js/jsd/jsd_step.c
index 4048e076faa..e2054637128 100644
--- a/js/jsd/jsd_step.c
+++ b/js/jsd/jsd_step.c
@@ -190,7 +190,7 @@ _callHook(JSDContext *jsdc, JSContext *cx, JSStackFrame *fp, JSBool before,
                         jsdouble delta;
                         now = JS_Now();
                         ll_delta = now - pdata->lastCallStart;
-                        delta = (JSFloat64) ll_delta;
+                        delta = ll_delta;
                         delta /= 1000.0;
                         pdata->totalExecutionTime += delta;
                         /* minExecutionTime starts as 0, so we need to overwrite
@@ -214,7 +214,7 @@ _callHook(JSDContext *jsdc, JSContext *cx, JSStackFrame *fp, JSBool before,
                              * running time as 'delta'. */
                             ll_delta = now - jsdc->lastReturnTime;
                             pdata->runningTime += ll_delta;
-                            delta = (JSFloat64) pdata->runningTime;
+                            delta = pdata->runningTime;
                             delta /= 1000.0;
                         }
                         
diff --git a/js/src/jscompat.h b/js/src/jscompat.h
index 903a96e0aa5..b1e5159cc5f 100644
--- a/js/src/jscompat.h
+++ b/js/src/jscompat.h
@@ -50,5 +50,4 @@ typedef JSIntn intN;
 typedef JSUintn uintN;
 typedef JSUword jsuword;
 typedef JSWord jsword;
-typedef float float32;
 #endif /* jscompat_h___ */
diff --git a/js/src/jsotypes.h b/js/src/jsotypes.h
index 212c67fc8bb..b185166dfd4 100644
--- a/js/src/jsotypes.h
+++ b/js/src/jsotypes.h
@@ -93,6 +93,4 @@ typedef JSInt16 int16;
 typedef JSInt8 int8;
 #endif /* AIX && HAVE_SYS_INTTYPES_H */
 
-typedef JSFloat64 float64;
-
 #endif /* !defined(PROTYPES_H) */
diff --git a/js/src/jspubtd.h b/js/src/jspubtd.h
index f87d0e6cf49..d831b403241 100644
--- a/js/src/jspubtd.h
+++ b/js/src/jspubtd.h
@@ -96,7 +96,7 @@ JS_BEGIN_EXTERN_C
 /* Scalar typedefs. */
 typedef JSInt32   jsint;
 typedef JSUint32  jsuint;
-typedef float64   jsdouble;
+typedef double    jsdouble;
 typedef JSInt32   jsrefcount;   /* PRInt32 if JS_THREADSAFE, see jslock.h */
 
 #ifdef WIN32
diff --git a/js/src/jstypes.h b/js/src/jstypes.h
index 51571604c04..2906a751234 100644
--- a/js/src/jstypes.h
+++ b/js/src/jstypes.h
@@ -340,13 +340,6 @@ JS_BEGIN_EXTERN_C
 typedef int JSIntn;
 typedef unsigned int JSUintn;
 
-/************************************************************************
-** TYPES:       JSFloat64
-** DESCRIPTION:
-**  NSPR's floating point type is always 64 bits.
-************************************************************************/
-typedef double          JSFloat64;
-
 /************************************************************************
 ** TYPES:       JSSize
 ** DESCRIPTION: