diff --git a/config/check_spidermonkey_style.py b/config/check_spidermonkey_style.py
index b7e5c6cf60c9..957b40f601e6 100644
--- a/config/check_spidermonkey_style.py
+++ b/config/check_spidermonkey_style.py
@@ -317,10 +317,6 @@ def is_module_header(enclosing_inclname, header_inclname):
     if m is not None and module.endswith('/' + m.group(1)):
         return True
 
-    # A weird public header case.
-    if module == 'jsmemorymetrics' and header_inclname == 'js/MemoryMetrics.h':
-        return True
-
     return False
 
 
diff --git a/js/src/config/check_spidermonkey_style.py b/js/src/config/check_spidermonkey_style.py
index b7e5c6cf60c9..957b40f601e6 100644
--- a/js/src/config/check_spidermonkey_style.py
+++ b/js/src/config/check_spidermonkey_style.py
@@ -317,10 +317,6 @@ def is_module_header(enclosing_inclname, header_inclname):
     if m is not None and module.endswith('/' + m.group(1)):
         return True
 
-    # A weird public header case.
-    if module == 'jsmemorymetrics' and header_inclname == 'js/MemoryMetrics.h':
-        return True
-
     return False
 
 
diff --git a/js/src/moz.build b/js/src/moz.build
index 66c46490727d..b0ef128b9396 100644
--- a/js/src/moz.build
+++ b/js/src/moz.build
@@ -99,6 +99,7 @@ CPP_SOURCES += [
     'MapObject.cpp',
     'Marking.cpp',
     'Memory.cpp',
+    'MemoryMetrics.cpp',
     'Module.cpp',
     'Monitor.cpp',
     'NameFunctions.cpp',
@@ -164,7 +165,6 @@ CPP_SOURCES += [
     'jsinfer.cpp',
     'jsiter.cpp',
     'jsmath.cpp',
-    'jsmemorymetrics.cpp',
     'jsnativestack.cpp',
     'jsnum.cpp',
     'jsobj.cpp',
diff --git a/js/src/jsmemorymetrics.cpp b/js/src/vm/MemoryMetrics.cpp
similarity index 100%
rename from js/src/jsmemorymetrics.cpp
rename to js/src/vm/MemoryMetrics.cpp