diff --git a/tools/qfcc/source/glsl-parse.y b/tools/qfcc/source/glsl-parse.y
index 125d90e48..3251f2531 100644
--- a/tools/qfcc/source/glsl-parse.y
+++ b/tools/qfcc/source/glsl-parse.y
@@ -402,11 +402,11 @@ multiplicative_expression
 
 additive_expression
 	: multiplicative_expression
-	| additive_expression '+' unary_expression
+	| additive_expression '+' multiplicative_expression
 		{
 			$$ = binary_expr ('+', $1, $3);
 		}
-	| additive_expression '-' unary_expression
+	| additive_expression '-' multiplicative_expression
 		{
 			$$ = binary_expr ('-', $1, $3);
 		}