diff --git a/plugins/fiber/uwsgiplugin.py b/plugins/fiber/uwsgiplugin.py
index ab38a37c..ff0d4cb5 100644
--- a/plugins/fiber/uwsgiplugin.py
+++ b/plugins/fiber/uwsgiplugin.py
@@ -24,6 +24,9 @@ else:
     CFLAGS.append('-I' + archdir)
     CFLAGS.append('-I' + archdir + '/' + arch)
     CFLAGS.append('-I' + includedir + '/' + arch)
+    archdir2 = os.popen(RUBYPATH + " -e \"require 'rbconfig';print %s::CONFIG['rubyarchhdrdir']\"" % rbconfig).read().rstrip()
+    if archdir2:
+        CFLAGS.append('-I' + archdir2)
 
 LDFLAGS = []
 LIBS = []
diff --git a/plugins/rack/uwsgiplugin.py b/plugins/rack/uwsgiplugin.py
index 3d8ee836..210b28e9 100644
--- a/plugins/rack/uwsgiplugin.py
+++ b/plugins/rack/uwsgiplugin.py
@@ -30,10 +30,12 @@ else:
     CFLAGS.append('-I' + includedir)
     archdir = os.popen(RUBYPATH + " -e \"require 'rbconfig';print %s::CONFIG['archdir']\"" % rbconfig).read().rstrip()
     arch = os.popen(RUBYPATH + " -e \"require 'rbconfig';print %s::CONFIG['arch']\"" % rbconfig).read().rstrip()
+    archdir2 = os.popen(RUBYPATH + " -e \"require 'rbconfig';print %s::CONFIG['rubyarchhdrdir']\"" % rbconfig).read().rstrip()
     CFLAGS.append('-I' + archdir)
     CFLAGS.append('-I' + archdir + '/' + arch)
     CFLAGS.append('-I' + includedir + '/' + arch)
-
+    if archdir2:
+        CFLAGS.append('-I' + archdir2)
 
 LDFLAGS = os.popen(RUBYPATH + " -e \"require 'rbconfig';print %s::CONFIG['LDFLAGS']\"" % rbconfig).read().rstrip().split()
 libpath = os.popen(RUBYPATH + " -e \"require 'rbconfig';print %s::CONFIG['libdir']\"" % rbconfig).read().rstrip()
diff --git a/plugins/rbthreads/uwsgiplugin.py b/plugins/rbthreads/uwsgiplugin.py
index 85132a66..79dfd240 100644
--- a/plugins/rbthreads/uwsgiplugin.py
+++ b/plugins/rbthreads/uwsgiplugin.py
@@ -24,6 +24,9 @@ else:
     CFLAGS.append('-I' + archdir)
     CFLAGS.append('-I' + archdir + '/' + arch)
     CFLAGS.append('-I' + includedir + '/' + arch)
+    archdir2 = os.popen(RUBYPATH + " -e \"require 'rbconfig';print %s::CONFIG['rubyarchhdrdir']\"" % rbconfig).read().rstrip()
+    if archdir2:
+        CFLAGS.append('-I' + archdir2)
 
 LDFLAGS = []
 LIBS = []