diff --git a/internal/shader/testdata/issue1236.expected.hlsl b/internal/shader/testdata/issue1236.expected.hlsl
index 4eaa6fa54..cf356f3e9 100644
--- a/internal/shader/testdata/issue1236.expected.hlsl
+++ b/internal/shader/testdata/issue1236.expected.hlsl
@@ -1,3 +1,5 @@
+void F0(in float4 l0, out float4 l1);
+
 void F0(in float4 l0, out float4 l1) {
 	float4 l2 = 0.0;
 	l2 = mul(l0, float4x4FromScalar(1.0));
diff --git a/internal/shader/testdata/out.expected.hlsl b/internal/shader/testdata/out.expected.hlsl
index 83a37eaed..791cc290f 100644
--- a/internal/shader/testdata/out.expected.hlsl
+++ b/internal/shader/testdata/out.expected.hlsl
@@ -1,3 +1,5 @@
+void F0(out float l0, out float l1[4], out float4 l2);
+
 void F0(out float l0, out float l1[4], out float4 l2) {
 	l0 = 0.0;
 	l1[0] = 0.0;
diff --git a/internal/shaderir/hlsl/hlsl.go b/internal/shaderir/hlsl/hlsl.go
index 7b0a3b455..b2bfde782 100644
--- a/internal/shaderir/hlsl/hlsl.go
+++ b/internal/shaderir/hlsl/hlsl.go
@@ -122,6 +122,9 @@ func Compile(p *shaderir.Program) (string, []int) {
 
 	if len(p.Funcs) > 0 {
 		lines = append(lines, "")
+		for _, f := range p.Funcs {
+			lines = append(lines, c.function(p, &f, true)...)
+		}
 		for _, f := range p.Funcs {
 			if len(lines) > 0 && lines[len(lines)-1] != "" {
 				lines = append(lines, "")