diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index 4912172e0f..faa255a5e3 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -3029,10 +3029,13 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 	} else {
 		left_type
 	}
-	if node.op in [.key_is, .not_is] {
+	op_is_key_is_or_not_is := node.op in [.key_is, .not_is]
+	if op_is_key_is_or_not_is {
 		g.is_expr(node)
 		return
 	}
+	op_is_key_in_or_not_in := node.op in [.key_in, .not_in]
+	op_is_eq_or_ne := node.op in [.eq, .ne]
 	right_sym := g.table.get_type_symbol(node.right_type)
 	has_eq_overloaded := !left_sym.has_method('==')
 	unaliased_right := if right_sym.info is table.Alias {
@@ -3040,7 +3043,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 	} else {
 		node.right_type
 	}
-	if unaliased_left == table.ustring_type_idx && node.op != .key_in && node.op != .not_in {
+	if unaliased_left == table.ustring_type_idx && !op_is_key_in_or_not_in {
 		fn_name := match node.op {
 			.plus {
 				'ustring_add('
@@ -3073,7 +3076,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 		g.write(', ')
 		g.expr(node.right)
 		g.write(')')
-	} else if unaliased_left == table.string_type_idx && node.op !in [.key_in, .not_in] {
+	} else if unaliased_left == table.string_type_idx && !op_is_key_in_or_not_in {
 		// `str == ''` -> `str.len == 0` optimization
 		if node.op in [.eq, .ne] && node.right is ast.StringLiteral
 			&& (node.right as ast.StringLiteral).val == '' {
@@ -3116,7 +3119,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 			g.expr(node.right)
 			g.write(')')
 		}
-	} else if node.op in [.eq, .ne] && left_sym.kind == .array && right_sym.kind == .array {
+	} else if op_is_eq_or_ne && left_sym.kind == .array && right_sym.kind == .array {
 		ptr_typ := g.gen_array_equality_fn(left_type)
 		if node.op == .ne {
 			g.write('!')
@@ -3132,8 +3135,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 		}
 		g.expr(node.right)
 		g.write(')')
-	} else if node.op in [.eq, .ne] && left_sym.kind == .array_fixed
-		&& right_sym.kind == .array_fixed {
+	} else if op_is_eq_or_ne && left_sym.kind == .array_fixed && right_sym.kind == .array_fixed {
 		ptr_typ := g.gen_fixed_array_equality_fn(left_type)
 		if node.op == .ne {
 			g.write('!')
@@ -3154,7 +3156,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 		}
 		g.expr(node.right)
 		g.write(')')
-	} else if node.op in [.eq, .ne] && left_sym.kind == .alias && right_sym.kind == .alias {
+	} else if op_is_eq_or_ne && left_sym.kind == .alias && right_sym.kind == .alias {
 		ptr_typ := g.gen_alias_equality_fn(left_type)
 		if node.op == .eq {
 			g.write('${ptr_typ}_alias_eq(')
@@ -3171,7 +3173,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 		}
 		g.expr(node.right)
 		g.write(')')
-	} else if node.op in [.eq, .ne] && left_sym.kind == .map && right_sym.kind == .map {
+	} else if op_is_eq_or_ne && left_sym.kind == .map && right_sym.kind == .map {
 		ptr_typ := g.gen_map_equality_fn(left_type)
 		if node.op == .eq {
 			g.write('${ptr_typ}_map_eq(')
@@ -3188,7 +3190,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 		}
 		g.expr(node.right)
 		g.write(')')
-	} else if node.op in [.eq, .ne] && left_sym.kind == .struct_ && right_sym.kind == .struct_ {
+	} else if op_is_eq_or_ne && left_sym.kind == .struct_ && right_sym.kind == .struct_ {
 		if !has_eq_overloaded {
 			// Define `==` as negation of Autogenerated `!=`
 			styp := g.typ(left_type)
@@ -3217,7 +3219,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 		}
 		g.expr(node.right)
 		g.write(')')
-	} else if node.op in [.key_in, .not_in] {
+	} else if op_is_key_in_or_not_in {
 		if node.op == .not_in {
 			g.write('!')
 		}