diff --git a/src/cmd/compile/internal/reflectdata/alg.go b/src/cmd/compile/internal/reflectdata/alg.go
index eb46ed84aa2..f74a42eac11 100644
--- a/src/cmd/compile/internal/reflectdata/alg.go
+++ b/src/cmd/compile/internal/reflectdata/alg.go
@@ -785,6 +785,9 @@ func (e *eqSigBuilder) build(t *types.Type) {
 			// The generated loops are kind of inefficient as well,
 			// so unroll the loop a bit.
 			const unrollSize = 32 // make loop body compare around this many bytes
+			if et.Size() == 0 {
+				break // zero-size elements need no comparison
+			}
 			unroll := max(1, unrollSize/et.Size())
 			// Do partial loops directly.
 			for n%unroll != 0 {
diff --git a/test/fixedbugs/issue77303.go b/test/fixedbugs/issue77303.go
new file mode 100644
index 00000000000..995e73b034a
--- /dev/null
+++ b/test/fixedbugs/issue77303.go
@@ -0,0 +1,19 @@
+// compile
+
+// Copyright 2026 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 77303: compiler crash on array of zero-size ASPECIAL elements.
+
+package p
+
+type zeroSizeSpecial struct {
+	_ [0]float64
+}
+
+var x [3]zeroSizeSpecial
+
+func f() bool {
+	return x == x
+}