diff --git a/Project.toml b/Project.toml
index c863a6a..6c6f196 100644
--- a/Project.toml
+++ b/Project.toml
@@ -4,11 +4,12 @@ version = "0.5.9"
 
 [deps]
 ExprTools = "e2ba6199-217a-4e67-a87a-7c52f15ade04"
+FastClosures = "9aa1b823-49e4-5ca5-8b0f-3971ec8bab6a"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 
 [compat]
-julia = "1"
 ExprTools = "0.1.0"
+julia = "1"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
diff --git a/src/TimerOutput.jl b/src/TimerOutput.jl
index ac1187e..0de6ade 100644
--- a/src/TimerOutput.jl
+++ b/src/TimerOutput.jl
@@ -237,12 +237,14 @@ function timer_expr_func(m::Module, is_debug::Bool, to, expr::Expr, label=nothin
 
     label === nothing && (label = string(def[:name]))
 
+    @gensym closure
     def[:body] = if is_debug
+        closure_ex = FastClosures.wrap_closure(m, :(
+            () -> $(def[:body])
+        ))
         quote
-            @inline function inner()
-                $(def[:body])
-            end
-            $(_timer_expr(m, is_debug, to, label, :(inner())))
+            $closure = $closure_ex
+            $(_timer_expr(m, is_debug, to, label, :($closure())))
         end
     else
         _timer_expr(m, is_debug, to, label, def[:body])
diff --git a/src/TimerOutputs.jl b/src/TimerOutputs.jl
index 4979733..83350af 100644
--- a/src/TimerOutputs.jl
+++ b/src/TimerOutputs.jl
@@ -2,6 +2,8 @@ module TimerOutputs
 
 using ExprTools
 
+using FastClosures
+
 import Base: show, time_ns
 export TimerOutput, @timeit, @timeit_debug, reset_timer!, print_timer, timeit,
                     enable_timer!, disable_timer!, @notimeit