diff --git a/simplecpp.cpp b/simplecpp.cpp
index 7afc17ab..b59f773c 100644
--- a/simplecpp.cpp
+++ b/simplecpp.cpp
@@ -1739,6 +1739,9 @@ namespace simplecpp {
             return tok;
         }
 
+        /**
+         * @throws Error thrown in case of __VA_OPT__ issues
+         */
         bool parseDefine(const Token *nametoken) {
             nameTokDef = nametoken;
             variadic = false;
@@ -3379,6 +3382,17 @@ void simplecpp::preprocess(simplecpp::TokenList &output, const simplecpp::TokenL
             }
             output.clear();
             return;
+        } catch (const simplecpp::Macro::Error& e) {
+            if (outputList) {
+                simplecpp::Output err{
+                    Output::DUI_ERROR,
+                    {},
+                    e.what
+                };
+                outputList->emplace_back(std::move(err));
+            }
+            output.clear();
+            return;
         }
     }
 
@@ -3507,14 +3521,14 @@ void simplecpp::preprocess(simplecpp::TokenList &output, const simplecpp::TokenL
                         else
                             it->second = macro;
                     }
-                } catch (const std::runtime_error &) {
+                } catch (const std::runtime_error &err) {
                     if (outputList) {
-                        simplecpp::Output err{
+                        simplecpp::Output out{
                             Output::SYNTAX_ERROR,
                             rawtok->location,
-                            "Failed to parse #define"
+                            std::string("Failed to parse #define, ") + err.what()
                         };
-                        outputList->emplace_back(std::move(err));
+                        outputList->emplace_back(std::move(out));
                     }
                     output.clear();
                     return;
diff --git a/test.cpp b/test.cpp
index 1dd59587..b0bf0b4f 100644
--- a/test.cpp
+++ b/test.cpp
@@ -698,7 +698,7 @@ static void define_invalid_1()
     const char code[] = "#define  A(\nB\n";
     simplecpp::OutputList outputList;
     ASSERT_EQUALS("", preprocess(code, &outputList));
-    ASSERT_EQUALS("file0,1,syntax_error,Failed to parse #define\n", toString(outputList));
+    ASSERT_EQUALS("file0,1,syntax_error,Failed to parse #define, bad macro syntax\n", toString(outputList));
 }
 
 static void define_invalid_2()
@@ -706,7 +706,7 @@ static void define_invalid_2()
     const char code[] = "#define\nhas#";
     simplecpp::OutputList outputList;
     ASSERT_EQUALS("", preprocess(code, &outputList));
-    ASSERT_EQUALS("file0,1,syntax_error,Failed to parse #define\n", toString(outputList));
+    ASSERT_EQUALS("file0,1,syntax_error,Failed to parse #define, bad macro syntax\n", toString(outputList));
 }
 
 static void define_define_1()
@@ -1105,6 +1105,15 @@ static void define_va_opt_8()
     ASSERT_EQUALS("", toString(outputList));
 }
 
+static void define_va_opt_9()
+{
+    simplecpp::DUI dui;
+    dui.defines.emplace_back("f(...)=__VA_OPT__");
+    simplecpp::OutputList outputList;
+    ASSERT_EQUALS("", preprocess("", dui, &outputList));
+    ASSERT_EQUALS("file0,0,dui_error,In definition of 'f': Missing opening parenthesis for __VA_OPT__\n", toString(outputList));
+}
+
 static void define_ifdef()
 {
     const char code[] = "#define A(X) X\n"
@@ -3674,6 +3683,7 @@ int main(int argc, char **argv)
     TEST_CASE(define_va_opt_6);
     TEST_CASE(define_va_opt_7);
     TEST_CASE(define_va_opt_8);
+    TEST_CASE(define_va_opt_9); // #632
 
     TEST_CASE(pragma_backslash); // multiline pragma directive