diff --git a/lib/lrama/output.rb b/lib/lrama/output.rb
index 20ffebbc..06d821c4 100644
--- a/lib/lrama/output.rb
+++ b/lib/lrama/output.rb
@@ -175,14 +175,14 @@ def user_actions
       str
     end
 
-    def omit_braces(param)
-      param[1..-2]
+    def omit_braces_and_blanks(param)
+      param[1..-2].strip
     end
 
     # b4_parse_param
     def parse_param
       if @grammar.parse_param
-        omit_braces(@grammar.parse_param)
+        omit_braces_and_blanks(@grammar.parse_param)
       else
         ""
       end
@@ -190,7 +190,7 @@ def parse_param
 
     def lex_param
       if @grammar.lex_param
-        omit_braces(@grammar.lex_param)
+        omit_braces_and_blanks(@grammar.lex_param)
       else
         ""
       end
diff --git a/spec/lrama/output_spec.rb b/spec/lrama/output_spec.rb
index 18ae7050..90b84506 100644
--- a/spec/lrama/output_spec.rb
+++ b/spec/lrama/output_spec.rb
@@ -19,17 +19,23 @@
   let(:grammar) { double("grammar") }
 
   describe "#parse_param" do
-    it "returns declaration of parse param without braces" do
+    it "returns declaration of parse param without braces/blanks" do
       allow(grammar).to receive(:parse_param).and_return("{struct parser_params *p}")
       expect(output.parse_param).to eq("struct parser_params *p")
+
+      allow(grammar).to receive(:parse_param).and_return("{ struct parser_params *p  }")
+      expect(output.parse_param).to eq("struct parser_params *p")
     end
   end
 
   describe "#user_formals" do
     context "when parse_param exists" do
-      it "returns declaration of parse param without braces with a leading comma" do
+      it "returns declaration of parse param without braces/blanks with a leading comma" do
         allow(grammar).to receive(:parse_param).and_return("{struct parser_params *p}")
         expect(output.user_formals).to eq(", struct parser_params *p")
+
+        allow(grammar).to receive(:parse_param).and_return("{ struct parser_params *p  }")
+        expect(output.user_formals).to eq(", struct parser_params *p")
       end
     end
 
@@ -43,9 +49,12 @@
 
   describe "#user_args" do
     context "when parse_param exists" do
-      it "returns name of parse param without braces with a leading comma" do
+      it "returns name of parse param without braces/blanks with a leading comma" do
         allow(grammar).to receive(:parse_param).and_return("{struct parser_params *p}")
         expect(output.user_args).to eq(", p")
+
+        allow(grammar).to receive(:parse_param).and_return("{ struct parser_params *p  }")
+        expect(output.user_args).to eq(", p")
       end
     end
 
@@ -61,6 +70,9 @@
     it "returns name of parse param" do
       allow(grammar).to receive(:parse_param).and_return("{struct parser_params *p}")
       expect(output.parse_param_name).to eq("p")
+
+      allow(grammar).to receive(:parse_param).and_return("{ struct parser_params *p  }")
+      expect(output.parse_param_name).to eq("p")
     end
   end
 
@@ -68,6 +80,9 @@
     it "returns name of lex param" do
       allow(grammar).to receive(:lex_param).and_return("{struct parser_params *p}")
       expect(output.lex_param_name).to eq("p")
+
+      allow(grammar).to receive(:lex_param).and_return("{ struct parser_params *p  }")
+      expect(output.lex_param_name).to eq("p")
     end
   end
 end