diff --git a/hwpfilter/source/formula.cxx b/hwpfilter/source/formula.cxx
index e220afe9d881..84982dcd9aae 100644
--- a/hwpfilter/source/formula.cxx
+++ b/hwpfilter/source/formula.cxx
@@ -580,6 +580,7 @@ void Formula::parse()
      }
 
      char *buf = static_cast<char *>(malloc(a.getLength()+1));
+     assert(buf && "Don't handle OOM conditions");
      bool bStart = false;
      int i, j;
      for( i = 0, j=0 ; i < a.getLength() ; i++){ // rtrim and ltrim 32 10 13
@@ -618,6 +619,7 @@ void Formula::trim()
 {
      int len = strlen(eq);
      char *buf = static_cast<char *>(malloc(len+1));
+     assert(buf && "Don't handle OOM conditions");
      bool bStart = false;
      int i, j;
      for( i = 0, j=0 ; i < len ; i++){ // rtrim and ltrim 32 10 13
diff --git a/hwpfilter/source/lexer.cxx b/hwpfilter/source/lexer.cxx
index cb6ae3fc4b49..844432268d92 100644
--- a/hwpfilter/source/lexer.cxx
+++ b/hwpfilter/source/lexer.cxx
@@ -220,7 +220,7 @@ typedef int yy_state_type;
 static yy_state_type yy_get_previous_state YY_PROTO(( ));
 static yy_state_type yy_try_NUL_trans YY_PROTO(( yy_state_type current_state ));
 static int yy_get_next_buffer YY_PROTO(( ));
-static void yy_fatal_error YY_PROTO(( yyconst char msg[] ));
+[[noreturn]] static void yy_fatal_error YY_PROTO(( yyconst char msg[] ));
 
 /* Done after the current pattern has been matched and before the
  * corresponding action - sets up yytext.