diff --git a/lib/preprocessor.cpp b/lib/preprocessor.cpp
index d20e43572..c26475fdb 100644
--- a/lib/preprocessor.cpp
+++ b/lib/preprocessor.cpp
@@ -1894,7 +1894,7 @@ public:
      * @param macrocode output string
      * @return true if the expanding was successful
      */
-    bool code(const std::vector<std::string> &params2, const std::map<std::string, PreprocessorMacro *> macros, std::string &macrocode) const
+    bool code(const std::vector<std::string> &params2, const std::map<std::string, PreprocessorMacro *> &macros, std::string &macrocode) const
     {
         if (_nopar || (_params.empty() && _variadic))
         {
@@ -2008,6 +2008,17 @@ public:
                                 break;
                             }
                         }
+
+                        // expand nopar macro
+                        const std::map<std::string, PreprocessorMacro *>::const_iterator it = macros.find(str);
+                        if (it != macros.end() && it->second->_macro.find("(") == std::string::npos)
+                        {
+                            str = it->second->_macro;
+                            if (str.find(" ") != std::string::npos)
+                                str.erase(0, str.find(" "));
+                            else
+                                str = "";
+                        }
                     }
                     if (_variadic && tok->str() == "," && tok->next() && tok->next()->str() == "##")
                     {
diff --git a/test/testpreprocessor.cpp b/test/testpreprocessor.cpp
index 1941363d8..49a54f1db 100644
--- a/test/testpreprocessor.cpp
+++ b/test/testpreprocessor.cpp
@@ -1411,7 +1411,7 @@ private:
             const char filedata[] = "#define A 4\n"
                                     "#define B(a) a,A\n"
                                     "B(2);\n";
-            ASSERT_EQUALS("\n\n2,4;\n", OurPreprocessor::expandMacros(filedata));
+            ASSERT_EQUALS("\n\n2, 4;\n", OurPreprocessor::expandMacros(filedata));
         }
 
         {
@@ -1642,6 +1642,14 @@ private:
                                  "#define ab(A,B) AB(A,B)\n"
                                  "ab(a,AB(b,c))\n";
         ASSERT_EQUALS("\n\nabc\n", OurPreprocessor::expandMacros(filedata5));
+
+        // Ticket #1802
+        const char filedata6[] = "#define AB_(A,B) A ## B\n"
+                                 "#define AB(A,B) AB_(A,B)\n"
+                                 "#define ab(suf) AB(X, AB_(_, suf))\n"
+                                 "#define X x\n"
+                                 "ab(y)\n";
+        ASSERT_EQUALS("\n\n\n\nx_y\n", OurPreprocessor::expandMacros(filedata6));
     }