diff --git a/src/back/glsl/mod.rs b/src/back/glsl/mod.rs
index 09cb1d7f0b..d26dce9af8 100644
--- a/src/back/glsl/mod.rs
+++ b/src/back/glsl/mod.rs
@@ -2799,6 +2799,17 @@ impl<'a, W: Write> Writer<'a, W> {
                 self.write_zero_init_value(base)?;
                 write!(self.out, ")")?;
             }
+            TypeInner::Struct { ref members, .. } => {
+                let name = &self.names[&NameKey::Type(ty)];
+                write!(self.out, "{}(", name)?;
+                for (i, member) in members.iter().enumerate() {
+                    self.write_zero_init_value(member.ty)?;
+                    if i != members.len().saturating_sub(1) {
+                        write!(self.out, ", ")?;
+                    }
+                }
+                write!(self.out, ")")?;
+            }
             _ => {} // TODO:
         }
 
@@ -3086,6 +3097,9 @@ fn is_value_init_supported(module: &crate::Module, ty: Handle<crate::Type>) -> b
         TypeInner::Array { base, size, .. } => {
             size != crate::ArraySize::Dynamic && is_value_init_supported(module, base)
         }
+        TypeInner::Struct { ref members, .. } => members
+            .iter()
+            .all(|member| is_value_init_supported(module, member.ty)),
         _ => false,
     }
 }
diff --git a/tests/out/glsl/interpolate.vert_main.Vertex.glsl b/tests/out/glsl/interpolate.vert_main.Vertex.glsl
index 588b72ac64..ea2920f860 100644
--- a/tests/out/glsl/interpolate.vert_main.Vertex.glsl
+++ b/tests/out/glsl/interpolate.vert_main.Vertex.glsl
@@ -18,7 +18,7 @@ smooth centroid out float _vs2fs_location5;
 smooth sample out float _vs2fs_location6;
 
 void main() {
-    FragmentInput out_;
+    FragmentInput out_ = FragmentInput(vec4(0.0, 0.0, 0.0, 0.0), 0u, 0.0, vec2(0.0, 0.0), vec3(0.0, 0.0, 0.0), vec4(0.0, 0.0, 0.0, 0.0), 0.0, 0.0);
     out_.position = vec4(2.0, 4.0, 5.0, 6.0);
     out_.flat_ = 8u;
     out_.linear = 27.0;
diff --git a/tests/out/glsl/operators.main.Compute.glsl b/tests/out/glsl/operators.main.Compute.glsl
index 10773041f4..d4ad691040 100644
--- a/tests/out/glsl/operators.main.Compute.glsl
+++ b/tests/out/glsl/operators.main.Compute.glsl
@@ -42,7 +42,7 @@ vec3 bool_cast(vec3 x) {
 }
 
 float constructors() {
-    Foo foo;
+    Foo foo = Foo(vec4(0.0, 0.0, 0.0, 0.0), 0);
     foo = Foo(vec4(1.0), 1);
     mat2x2 mat2comp = mat2x2(vec2(1.0, 0.0), vec2(0.0, 1.0));
     mat4x4 mat4comp = mat4x4(vec4(1.0, 0.0, 0.0, 0.0), vec4(0.0, 1.0, 0.0, 0.0), vec4(0.0, 0.0, 1.0, 0.0), vec4(0.0, 0.0, 0.0, 1.0));
diff --git a/tests/out/glsl/quad-vert.main.Vertex.glsl b/tests/out/glsl/quad-vert.main.Vertex.glsl
index d3c740e05b..c5a98c7cde 100644
--- a/tests/out/glsl/quad-vert.main.Vertex.glsl
+++ b/tests/out/glsl/quad-vert.main.Vertex.glsl
@@ -17,7 +17,7 @@ vec2 v_uv = vec2(0.0, 0.0);
 
 vec2 a_uv_1 = vec2(0.0, 0.0);
 
-gen_gl_PerVertex perVertexStruct;
+gen_gl_PerVertex perVertexStruct = gen_gl_PerVertex(vec4(0.0, 0.0, 0.0, 1.0), 1.0, float[1](0.0), float[1](0.0));
 
 vec2 a_pos_1 = vec2(0.0, 0.0);