diff --git a/backends.py b/backends.py
index 559113987..577e1b8c2 100644
--- a/backends.py
+++ b/backends.py
@@ -241,7 +241,7 @@ class Backend():
     def get_pch_include_args(self, compiler, target):
         args = []
         pchpath = self.get_target_private_dir(target)
-        includearg = compiler.get_include_arg(pchpath)
+        includeargs = compiler.get_include_args(pchpath)
         for lang in ['c', 'cpp']:
             p = target.get_pch(lang)
             if len(p) == 0:
@@ -250,7 +250,7 @@ class Backend():
                 header = p[0]
                 args += compiler.get_pch_use_args(pchpath, header)
         if len(args) > 0:
-            args = [includearg] + args
+            args = includeargs + args
         return args
 
     def generate_basic_compiler_args(self, target, compiler):
diff --git a/environment.py b/environment.py
index 6a56ac9a0..cf32d5e2d 100644
--- a/environment.py
+++ b/environment.py
@@ -187,8 +187,8 @@ class CCompiler():
     def get_std_exe_link_args(self):
         return []
 
-    def get_include_arg(self, path):
-        return '-I' + path
+    def get_include_args(self, path):
+        return ['-I' + path]
 
     def get_std_shared_lib_link_args(self):
         return ['-shared']
@@ -552,8 +552,8 @@ class MonoCompiler():
     def get_std_exe_link_args(self):
         return []
 
-    def get_include_arg(self, path):
-        return ''
+    def get_include_args(self, path):
+        return []
 
     def get_std_shared_lib_link_args(self):
         return []
@@ -694,8 +694,8 @@ class JavaCompiler():
     def get_std_exe_link_args(self):
         return []
 
-    def get_include_arg(self, path):
-        return ''
+    def get_include_args(self, path):
+        return []
 
     def get_std_shared_lib_link_args(self):
         return []
@@ -1228,11 +1228,11 @@ end program prog
             return True
         return False
 
-    def get_include_arg(self, path):
-        return '-I' + path
+    def get_include_args(self, path):
+        return ['-I' + path]
 
-    def get_module_outdir_arg(self, path):
-        return '-J' + path
+    def get_module_outdir_args(self, path):
+        return ['-J' + path]
 
     def get_depfile_suffix(self):
         return 'd'
diff --git a/ninjabackend.py b/ninjabackend.py
index 08e43b44a..1ab107c25 100644
--- a/ninjabackend.py
+++ b/ninjabackend.py
@@ -1062,7 +1062,7 @@ rule FORTRAN_DEP_HACK
         extra_orderdeps = []
         compiler = self.get_compiler_for_source(src)
         commands = self.generate_basic_compiler_args(target, compiler)
-        commands.append(compiler.get_include_arg(self.get_target_private_dir(target)))
+        commands += compiler.get_include_args(self.get_target_private_dir(target))
         if isinstance(src, RawFilename):
             rel_src = src.fname
         elif is_generated:
@@ -1100,10 +1100,10 @@ rule FORTRAN_DEP_HACK
             for d in i.get_incdirs():
                 expdir =  os.path.join(basedir, d)
                 fulldir = os.path.join(self.environment.get_source_dir(), expdir)
-                barg = compiler.get_include_arg(expdir)
-                sarg = compiler.get_include_arg(fulldir)
-                commands.append(barg)
-                commands.append(sarg)
+                bargs = compiler.get_include_args(expdir)
+                sargs = compiler.get_include_args(fulldir)
+                commands += bargs
+                commands += sargs
         if self.environment.coredata.use_pch:
             commands += self.get_pch_include_args(compiler, target)
         crstr = ''
@@ -1121,7 +1121,7 @@ rule FORTRAN_DEP_HACK
                 if srcfile == src:
                     depelem = NinjaBuildElement(modfile, 'FORTRAN_DEP_HACK', rel_obj)
                     depelem.write(outfile)
-            commands.append(compiler.get_module_outdir_arg(os.path.join(self.get_target_dir(target), target.get_basename() + '.dir')))
+            commands += compiler.get_module_outdir_args(os.path.join(self.get_target_dir(target), target.get_basename() + '.dir'))
 
         element = NinjaBuildElement(rel_obj, compiler_name, rel_src)
         for d in header_deps: