diff --git a/js/src/jit/x64/MacroAssembler-x64.cpp b/js/src/jit/x64/MacroAssembler-x64.cpp
index 0c448b36145b..bc05bb963d81 100644
--- a/js/src/jit/x64/MacroAssembler-x64.cpp
+++ b/js/src/jit/x64/MacroAssembler-x64.cpp
@@ -424,7 +424,7 @@ MacroAssembler::subFromStackPtr(Imm32 imm32)
         // On windows, we cannot skip very far down the stack without touching the
         // memory pages in-between.  This is a corner-case code for situations where the
         // Ion frame data for a piece of code is very large.  To handle this special case,
-        // for frames over 1k in size we allocate memory on the stack incrementally, touching
+        // for frames over 4k in size we allocate memory on the stack incrementally, touching
         // it as we go.
         //
         // When the amount is quite large, which it can be, we emit an actual loop, in order
diff --git a/js/src/jit/x86/MacroAssembler-x86.cpp b/js/src/jit/x86/MacroAssembler-x86.cpp
index 903157a9edb6..40b46362fbd8 100644
--- a/js/src/jit/x86/MacroAssembler-x86.cpp
+++ b/js/src/jit/x86/MacroAssembler-x86.cpp
@@ -331,7 +331,7 @@ MacroAssembler::subFromStackPtr(Imm32 imm32)
         // On windows, we cannot skip very far down the stack without touching the
         // memory pages in-between.  This is a corner-case code for situations where the
         // Ion frame data for a piece of code is very large.  To handle this special case,
-        // for frames over 1k in size we allocate memory on the stack incrementally, touching
+        // for frames over 4k in size we allocate memory on the stack incrementally, touching
         // it as we go.
         //
         // When the amount is quite large, which it can be, we emit an actual loop, in order