diff --git a/autoload/ale/c.vim b/autoload/ale/c.vim
index c7b1e20a..946eeca4 100644
--- a/autoload/ale/c.vim
+++ b/autoload/ale/c.vim
@@ -506,6 +506,10 @@ function! ale#c#GetMakeCommand(buffer) abort
     if s:CanParseMakefile(a:buffer)
         let l:path = ale#path#FindNearestFile(a:buffer, 'Makefile')
 
+        if empty(l:path)
+            let l:path = ale#path#FindNearestFile(a:buffer, 'GNUmakefile')
+        endif
+
         if !empty(l:path)
             let l:always_make = ale#Var(a:buffer, 'c_always_make')
 
diff --git a/test/test_c_flag_parsing.vader b/test/test_c_flag_parsing.vader
index 8b02f2b9..319e10dd 100644
--- a/test/test_c_flag_parsing.vader
+++ b/test/test_c_flag_parsing.vader
@@ -38,6 +38,14 @@ Execute(The make command should be correct):
   \   . 'make -n',
   \ ale#c#GetMakeCommand(bufnr(''))
 
+Execute(Should recognize GNUmakefile as a makefile):
+  call ale#test#SetFilename('test_c_projects/gnumakefile_project/file.c')
+
+  AssertEqual
+  \ ale#path#CdString(ale#path#Simplify(g:dir. '/test_c_projects/gnumakefile_project'))
+  \   . 'make -n --always-make',
+  \ ale#c#GetMakeCommand(bufnr(''))
+
 Execute(The CFlags parser should be able to parse include directives):
   call ale#test#SetFilename('test_c_projects/makefile_project/subdir/file.c')
 
diff --git a/test/test_c_projects/gnumakefile_project/GNUmakefile b/test/test_c_projects/gnumakefile_project/GNUmakefile
new file mode 100644
index 00000000..e69de29b
diff --git a/test/test_c_projects/gnumakefile_project/file.c b/test/test_c_projects/gnumakefile_project/file.c
new file mode 100644
index 00000000..e69de29b