6 files changed, 5 insertions, 6 deletions
diff --git a/build_config/host-cxx.rb b/build_config/host-cxx.rb
index 21b4cd417..ae313e45d 100644
--- a/build_config/host-cxx.rb
+++ b/build_config/host-cxx.rb
@@ -1,7 +1,6 @@
 MRuby::Build.new do |conf|
   toolchain :gcc
 
-  enable_debug
   # include the default GEMs
   conf.gembox 'default'
 
diff --git a/build_config/host-debug.rb b/build_config/host-debug.rb
index e798278b9..9be1f6574 100644
--- a/build_config/host-debug.rb
+++ b/build_config/host-debug.rb
@@ -8,7 +8,7 @@ MRuby::Build.new('host') do |conf|
     toolchain :gcc
   end
 
-  enable_debug
+  conf.enable_debug
 
   # include the default GEMs
   conf.gembox 'full-core'
diff --git a/build_config/host-gprof.rb b/build_config/host-gprof.rb
index 2689dc9b2..2bdf5bebd 100644
--- a/build_config/host-gprof.rb
+++ b/build_config/host-gprof.rb
@@ -9,6 +9,6 @@ MRuby::Build.new do |conf|
   conf.linker.flags << '-pg'
 
   # Turn on `enable_debug` for better debugging
-  enable_debug
+  conf.enable_debug
   conf.enable_test
 end
diff --git a/build_config/host-shared.rb b/build_config/host-shared.rb
index 8b5028837..4225d7f4f 100644
--- a/build_config/host-shared.rb
+++ b/build_config/host-shared.rb
@@ -30,7 +30,7 @@ MRuby::Build.new do |conf|
   # conf.file_separator = '/'
 
   # Turn on `enable_debug` for better debugging
-  enable_debug
+  conf.enable_debug
   conf.enable_bintest
   conf.enable_test
 end
diff --git a/build_config/travis.rb b/build_config/travis.rb
index 1d0e18b6b..3c6647b45 100644
--- a/build_config/travis.rb
+++ b/build_config/travis.rb
@@ -1,6 +1,6 @@
 MRuby::Build.new('full-debug') do |conf|
   toolchain :gcc
-  enable_debug
+  conf.enable_debug
 
   # include all core GEMs
   conf.gembox 'full-core'
diff --git a/mrbgems/mruby-method/README.md b/mrbgems/mruby-method/README.md
index 21ef0a936..89f90bed8 100644
--- a/mrbgems/mruby-method/README.md
+++ b/mrbgems/mruby-method/README.md
@@ -15,7 +15,7 @@ You need to enable debug option in your build configuration to use
 
 ```ruby
 MRuby::Build.new do |conf|
-  enable_debug
+  conf.enable_debug
 end
 ```