diff --git a/ext/vulkan/shaders/meson.build b/ext/vulkan/shaders/meson.build
index f822dd0eb5..6048f631e7 100644
--- a/ext/vulkan/shaders/meson.build
+++ b/ext/vulkan/shaders/meson.build
@@ -18,17 +18,16 @@ bin2array = find_program('bin2array.py')
 # FIXME: meson compiler class instead?
 glslc_build_options = []
 optimization = get_option('optimization')
-buildtype = get_option('buildtype')
-if get_option('debug') or optimization == 'g' or ['debug', 'debugoptimized'].contains(buildtype)
+if get_option('debug')
   glslc_build_options += ['-g']
 endif
 if get_option('werror')
   glslc_build_options += ['-Werror']
 endif
-if buildtype == 'minsize' or optimization == 's'
+if optimization == 's'
   glslc_build_options += ['-Os']
 endif
-if ['release', 'debugoptimized'].contains(buildtype) or ['1', '2', '3'].contains(optimization)
+if optimization in ['1', '2', '3']
   glslc_build_options += ['-O']
 endif
 
diff --git a/meson.build b/meson.build
index 92b271025e..5f992891b0 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('gst-plugins-bad', 'c', 'cpp',
   version : '1.17.0.1',
-  meson_version : '>= 0.48',
+  meson_version : '>= 0.49',
   default_options : [ 'warning_level=1',
                       'buildtype=debugoptimized' ])
 
diff --git a/sys/d3d11/meson.build b/sys/d3d11/meson.build
index 53f1b71a4c..dad075c94d 100644
--- a/sys/d3d11/meson.build
+++ b/sys/d3d11/meson.build
@@ -86,7 +86,7 @@ if not have_d3d11
 endif
 
 # for enabling debug layer
-if get_option('buildtype').startswith('debug')
+if get_option('debug')
   d3d11_debug_libs = [
     ['d3d11sdklayers.h', 'ID3D11Debug', 'ID3D11InfoQueue', 'have_d3d11sdk_h'],
     ['dxgidebug.h', 'IDXGIDebug', 'IDXGIInfoQueue', 'have_dxgidebug_h'],