diff --git a/tools/qfcc/include/expr.h b/tools/qfcc/include/expr.h
index f09d3df28..e2ef252ca 100644
--- a/tools/qfcc/include/expr.h
+++ b/tools/qfcc/include/expr.h
@@ -740,6 +740,8 @@ unsigned short expr_ushort (const expr_t *e) __attribute__((pure));
 
 int expr_integral (const expr_t *e) __attribute__((pure));
 
+bool is_error (const expr_t *e) __attribute__((pure));
+
 /**	Check if the expression refers to a constant value.
 
 	\param e		The expression to check.
diff --git a/tools/qfcc/source/expr.c b/tools/qfcc/source/expr.c
index 35a1c7f97..17ddd1766 100644
--- a/tools/qfcc/source/expr.c
+++ b/tools/qfcc/source/expr.c
@@ -861,6 +861,12 @@ new_short_expr (short short_val)
 	return new_value_expr (new_short_val (short_val), false);
 }
 
+bool
+is_error (const expr_t *e)
+{
+	return e->type == ex_error;
+}
+
 int
 is_constant (const expr_t *e)
 {