diff --git a/lib/mutant/repository.rb b/lib/mutant/repository.rb
index 963516a9..a2316f01 100644
--- a/lib/mutant/repository.rb
+++ b/lib/mutant/repository.rb
@@ -41,6 +41,7 @@ module Mutant
         command = %W[
           git log
           #{from}...#{to}
+          --ignore-all-space
           -L #{line_range.begin},#{line_range.end}:#{path}
         ]
 
diff --git a/spec/unit/mutant/repository/diff_spec.rb b/spec/unit/mutant/repository/diff_spec.rb
index 6ba60965..a19ac9a9 100644
--- a/spec/unit/mutant/repository/diff_spec.rb
+++ b/spec/unit/mutant/repository/diff_spec.rb
@@ -75,7 +75,7 @@ describe Mutant::Repository::Diff do
       end
 
       let(:expected_git_log_command) do
-        %W[git log from_rev...to_rev -L 1,2:#{path}]
+        %W[git log from_rev...to_rev --ignore-all-space -L 1,2:#{path}]
       end
 
       context 'on failure of git log command' do