diff --git a/build/moz.build b/build/moz.build
index d6d46dbdb21b..cbe6d6de9d22 100644
--- a/build/moz.build
+++ b/build/moz.build
@@ -114,8 +114,8 @@ OBJDIR_FILES += ['/.ycm_extra_conf.py']
 if CONFIG['MOZ_VALGRIND']:
     OBJDIR_FILES._valgrind += [
         'valgrind/cross-architecture.sup',
-        'valgrind/i386-redhat-linux-gnu.sup',
-        'valgrind/x86_64-redhat-linux-gnu.sup',
+        'valgrind/i386-pc-linux-gnu.sup',
+        'valgrind/x86_64-pc-linux-gnu.sup',
     ]
 
 if CONFIG['MOZ_ARTIFACT_BUILDS']:
diff --git a/build/valgrind/i386-redhat-linux-gnu.sup b/build/valgrind/i386-pc-linux-gnu.sup
similarity index 100%
rename from build/valgrind/i386-redhat-linux-gnu.sup
rename to build/valgrind/i386-pc-linux-gnu.sup
diff --git a/build/valgrind/mach_commands.py b/build/valgrind/mach_commands.py
index c0161ab5bb9f..770b88e74bea 100644
--- a/build/valgrind/mach_commands.py
+++ b/build/valgrind/mach_commands.py
@@ -5,6 +5,7 @@
 from __future__ import absolute_import, unicode_literals
 
 import logging
+import mozinfo
 import os
 import subprocess
 
@@ -130,12 +131,15 @@ class MachCommands(MachCommandBase):
             supps_file1 = os.path.join(supps_dir, 'cross-architecture.sup')
             valgrind_args.append('--suppressions=' + supps_file1)
 
-            # MACHTYPE is an odd bash-only environment variable that doesn't
-            # show up in os.environ, so we have to get it another way.
-            machtype = subprocess.check_output(['bash', '-c', 'echo $MACHTYPE']).rstrip()
-            supps_file2 = os.path.join(supps_dir, machtype + '.sup')
-            if os.path.isfile(supps_file2):
-                valgrind_args.append('--suppressions=' + supps_file2)
+            if mozinfo.os == 'linux':
+                machtype = {
+                    'x86_64': 'x86_64-pc-linux-gnu',
+                    'x86': 'i386-pc-linux-gnu',
+                }.get(mozinfo.processor)
+                if machtype:
+                    supps_file2 = os.path.join(supps_dir, machtype + '.sup')
+                    if os.path.isfile(supps_file2):
+                        valgrind_args.append('--suppressions=' + supps_file2)
 
             exitcode = None
             timeout = 1800
diff --git a/build/valgrind/x86_64-redhat-linux-gnu.sup b/build/valgrind/x86_64-pc-linux-gnu.sup
similarity index 100%
rename from build/valgrind/x86_64-redhat-linux-gnu.sup
rename to build/valgrind/x86_64-pc-linux-gnu.sup
diff --git a/testing/mochitest/mochitest_options.py b/testing/mochitest/mochitest_options.py
index 7542eb7c441b..592f66688311 100644
--- a/testing/mochitest/mochitest_options.py
+++ b/testing/mochitest/mochitest_options.py
@@ -96,10 +96,10 @@ def get_default_valgrind_suppression_files():
     rv = []
     if mozinfo.os == "linux":
         if mozinfo.processor == "x86_64":
-            rv.append(os.path.join(supps_path, "x86_64-redhat-linux-gnu.sup"))
+            rv.append(os.path.join(supps_path, "x86_64-pc-linux-gnu.sup"))
             rv.append(os.path.join(supps_path, "cross-architecture.sup"))
         elif mozinfo.processor == "x86":
-            rv.append(os.path.join(supps_path, "i386-redhat-linux-gnu.sup"))
+            rv.append(os.path.join(supps_path, "i386-pc-linux-gnu.sup"))
             rv.append(os.path.join(supps_path, "cross-architecture.sup"))
 
     return rv
diff --git a/testing/mochitest/moz.build b/testing/mochitest/moz.build
index 44c115fd0b3d..8b2819dde7db 100644
--- a/testing/mochitest/moz.build
+++ b/testing/mochitest/moz.build
@@ -39,8 +39,8 @@ TEST_HARNESS_FILES.testing.mochitest += [
     '/build/sanitizers/lsan_suppressions.txt',
     '/build/sanitizers/ubsan_suppressions.txt',
     '/build/valgrind/cross-architecture.sup',
-    '/build/valgrind/i386-redhat-linux-gnu.sup',
-    '/build/valgrind/x86_64-redhat-linux-gnu.sup',
+    '/build/valgrind/i386-pc-linux-gnu.sup',
+    '/build/valgrind/x86_64-pc-linux-gnu.sup',
     '/netwerk/test/httpserver/httpd.js',
     'bisection.py',
     'browser-harness.xul',
diff --git a/testing/mozharness/configs/unittests/linux_unittest.py b/testing/mozharness/configs/unittests/linux_unittest.py
index 5a8b458ba8a0..0be74d31e313 100644
--- a/testing/mozharness/configs/unittests/linux_unittest.py
+++ b/testing/mozharness/configs/unittests/linux_unittest.py
@@ -21,14 +21,14 @@ if platform.architecture()[0] == "64bit":
     TOOLTOOL_MANIFEST_PATH = "config/tooltool-manifests/linux64/releng.manifest"
     MINIDUMP_STACKWALK_PATH = "linux64-minidump_stackwalk"
     VALGRIND_SUPP_ARCH = os.path.join(VALGRIND_SUPP_DIR,
-                                      "x86_64-redhat-linux-gnu.sup")
+                                      "x86_64-pc-linux-gnu.sup")
     NODEJS_PATH = "node-linux-x64/bin/node"
     NODEJS_TOOLTOOL_MANIFEST_PATH = "config/tooltool-manifests/linux64/nodejs.manifest"
 else:
     TOOLTOOL_MANIFEST_PATH = "config/tooltool-manifests/linux32/releng.manifest"
     MINIDUMP_STACKWALK_PATH = "linux32-minidump_stackwalk"
     VALGRIND_SUPP_ARCH = os.path.join(VALGRIND_SUPP_DIR,
-                                      "i386-redhat-linux-gnu.sup")
+                                      "i386-pc-linux-gnu.sup")
     NODEJS_PATH = "node-linux-x86/bin/node"
     NODEJS_TOOLTOOL_MANIFEST_PATH = "config/tooltool-manifests/linux32/nodejs.manifest"
 
diff --git a/toolkit/xre/glxtest.cpp b/toolkit/xre/glxtest.cpp
index e510e9a30bf4..6850959c2401 100644
--- a/toolkit/xre/glxtest.cpp
+++ b/toolkit/xre/glxtest.cpp
@@ -105,7 +105,7 @@ x_error_handler(Display *, XErrorEvent *ev)
 
 
 // glxtest is declared inside extern "C" so that the name is not mangled.
-// The name is used in build/valgrind/x86_64-redhat-linux-gnu.sup to suppress
+// The name is used in build/valgrind/x86_64-pc-linux-gnu.sup to suppress
 // memory leak errors because we run it inside a short lived fork and we don't
 // care about leaking memory
 extern "C" {