diff --git a/include/psyc/parser.h b/include/psyc/parser.h
index bff444d..984ae84 100644
--- a/include/psyc/parser.h
+++ b/include/psyc/parser.h
@@ -21,6 +21,7 @@
 
 typedef enum
 {
+	/// Parse only the header
 	PSYC_PARSE_HEADER_ONLY = 1,
 	/// Expects only the content part of a packet. The length of the content must fit exactly in this case
 	PSYC_PARSE_BEGIN_AT_CONTENT = 2, 
@@ -32,6 +33,8 @@ typedef enum
  */
 typedef enum
 {
+	/// Invalid combination of flags
+	PSYC_PARSE_ERROR_INVALID_FLAGS = -10,
 	PSYC_PARSE_ERROR_END = -9,
 	PSYC_PARSE_ERROR_BODY = -8,
 	PSYC_PARSE_ERROR_METHOD = -7,
diff --git a/src/parser.c b/src/parser.c
index bb92526..6e84964 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -136,6 +136,10 @@ inline psycParseRC psyc_parseName(psycParseState* state, psycString* name)
  */
 inline psycParseRC psyc_parseBinaryValue(psycParseState* state, psycString* value, size_t* length, size_t* parsed)
 {
+	if (state->flags & PSYC_PARSE_HEADER_ONLY &&
+			state->flags & PSYC_PARSE_BEGIN_AT_CONTENT)
+		return PSYC_PARSE_ERROR_INVALID_FLAGS;
+		
 	size_t remaining = *length - *parsed;
 	value->ptr = state->buffer.ptr + state->cursor;