diff --git a/src/stubser/cfile_parser.c b/src/stubser/cfile_parser.c
index 1f87026..2a3dbf0 100644
--- a/src/stubser/cfile_parser.c
+++ b/src/stubser/cfile_parser.c
@@ -286,7 +286,7 @@ STATIC cfile_block_return_t cBlockDetection(const char *aBlockStart, const char
  * @retval -1 Invalid block ending ("end" without corresponding "start")
  * @retval -2 Null pointer detected
  */
-STATIC int8_t cBlockRemoval(char *aLine, const char *aBlockStart, const char *aBlockEnd, uint32_t *aHelper, bool aRemove)
+STATIC int8_t cBlockRemoval(char *aLine, const char *aBlockStart, const char *aBlockEnd, uint32_t *aHelper, bool aRemove, bool aIgnore)
 {
    const uint8_t depth = 1; // preparation to support which depth should be removed for nested block
    bool blockLine = false;
@@ -316,10 +316,19 @@ STATIC int8_t cBlockRemoval(char *aLine, const char *aBlockStart, const char *aB
       {
          case CFILE_BLOCK_DETECT_START:
          {
-            ++*aHelper;
-            if (NULL == blockStart && depth <= *aHelper)
+            // additional starts within depth are ignored if aIgnore is true
+            // e.g. C comments are not allowed to be nested
+            if (!(aIgnore && depth <= *aHelper))
             {
-               blockStart = blockMatch;
+               ++*aHelper;
+               if (NULL == blockStart && depth <= *aHelper)
+               {
+                  blockStart = blockMatch;
+               }
+            }
+            else
+            {
+               printf("[WARN] Nested block start (see file below): %s", aLine);
             }
             blockWorker = (aRemove ? blockMatch + strlen(aBlockStart) : blockMatch);
             break;
@@ -419,7 +428,7 @@ STATIC int8_t removeCcomments(char *aLine)
       comment = NULL;
    }
 
-   return cBlockRemoval(aLine, CPARS_COMMENT_BLOCK_START, CPARS_COMMENT_BLOCK_END, &cfile_parser_removeCommentHelper, true);
+   return cBlockRemoval(aLine, CPARS_COMMENT_BLOCK_START, CPARS_COMMENT_BLOCK_END, &cfile_parser_removeCommentHelper, true, true);
 }
 
 STATIC int8_t evaluateParameter(char *aParameter, cfunction_t *aFunction)
@@ -480,7 +489,7 @@ STATIC cfunction_t* cfile_parser_evaluateLine(char *aLine)
    {
       return NULL;
    }
-   if (0 != cBlockRemoval(aLine, "{", "}", &cfile_parser_removeBraceHelper, false))
+   if (0 != cBlockRemoval(aLine, "{", "}", &cfile_parser_removeBraceHelper, false, false))
    {
       return NULL;
    }