diff --git a/src/preprocessor.cpp b/src/preprocessor.cpp
index c26d132d6..84d9c0fae 100644
--- a/src/preprocessor.cpp
+++ b/src/preprocessor.cpp
@@ -865,10 +865,14 @@ std::string Preprocessor::expandMacros(std::string code)
                     {
                         params.push_back(par);
                         par = "";
+                    }
+                    else if (code[pos2] == ' ')
+                    {
+
                     }
                     else if (parlevel >= 1)
                     {
-                        par += std::string(1, code[pos2]);
+                        par.append(1, code[pos2]);
                     }
                 }
             }
diff --git a/test/testpreprocessor.cpp b/test/testpreprocessor.cpp
index 68ed554bf..2a45ffa8f 100644
--- a/test/testpreprocessor.cpp
+++ b/test/testpreprocessor.cpp
@@ -108,7 +108,7 @@ private:
 
         TEST_CASE(stringify);
         TEST_CASE(stringify2);
-        // TODO TEST_CASE(stringify3);
+        TEST_CASE(stringify3);
         TEST_CASE(ifdefwithfile);
         TEST_CASE(pragma);
     }
@@ -703,7 +703,7 @@ private:
         // Preprocess..
         std::string actual = OurPreprocessor::expandMacros(filedata);
 
-        ASSERT_EQUALS("\nprintf(\"[0x%lx-0x%lx)\", pstart, pend);", actual);
+        ASSERT_EQUALS("\nprintf(\"[0x%lx-0x%lx)\",pstart,pend);", actual);
     }
 
     void fmt2()