diff --git a/powerline/bindings/config.py b/powerline/bindings/config.py
index f0617f10..529cdb1f 100644
--- a/powerline/bindings/config.py
+++ b/powerline/bindings/config.py
@@ -164,7 +164,10 @@ def init_tmux_environment(pl, args, set_tmux_environment=set_tmux_environment):
 				# But it does not support empty attributes as well.
 				or 'none'))
 		else:
-			set_tmux_environment(varname, 'colour' + str(get_highlighting(group)[attr][0]))
+			if powerline.common_config['term_truecolor'] is True:
+				set_tmux_environment(varname, '#{0:06x}'.format(get_highlighting(group)[attr][1]))
+			else:
+				set_tmux_environment(varname, 'colour' + str(get_highlighting(group)[attr][0]))
 
 	left_dividers = powerline.renderer.theme.dividers['left']
 	set_tmux_environment('_POWERLINE_LEFT_HARD_DIVIDER', left_dividers['hard'])
diff --git a/powerline/renderers/tmux.py b/powerline/renderers/tmux.py
index 840bbdda..ee6c09c2 100644
--- a/powerline/renderers/tmux.py
+++ b/powerline/renderers/tmux.py
@@ -48,12 +48,18 @@ class TmuxRenderer(Renderer):
 			if fg is False or fg[0] is False:
 				tmux_attrs += ['fg=default']
 			else:
-				tmux_attrs += ['fg=colour' + str(fg[0])]
+				if self.term_truecolor and fg[1]:
+					tmux_attrs += ['fg=#{0:06x}'.format(int(fg[1]))]
+				else:
+					tmux_attrs += ['fg=colour' + str(fg[0])]
 		if bg is not None:
 			if bg is False or bg[0] is False:
 				tmux_attrs += ['bg=default']
 			else:
-				tmux_attrs += ['bg=colour' + str(bg[0])]
+				if self.term_truecolor and bg[1]:
+					tmux_attrs += ['bg=#{0:06x}'.format(int(bg[1]))]
+				else:
+					tmux_attrs += ['bg=colour' + str(bg[0])]
 		if attrs is not None:
 			tmux_attrs += attrs_to_tmux_attrs(attrs)
 		return '#[' + ','.join(tmux_attrs) + ']'