diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index 12c955f2..c308916e 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -4120,6 +4120,22 @@ static bool add_ternary(struct hlsl_ctx *ctx, struct hlsl_block *block,
             common_type = hlsl_get_numeric_type(ctx, cond_type->class,
                     common_type->base_type, cond_type->dimx, cond_type->dimy);
         }
+        else if (cond_type->dimx != common_type->dimx || cond_type->dimy != common_type->dimy)
+        {
+            /* This condition looks wrong but is correct.
+             * floatN is compatible with float1xN, but not with floatNx1. */
+
+            struct vkd3d_string_buffer *cond_string, *value_string;
+
+            cond_string = hlsl_type_to_string(ctx, cond_type);
+            value_string = hlsl_type_to_string(ctx, common_type);
+            if (cond_string && value_string)
+                hlsl_error(ctx, &first->loc, VKD3D_SHADER_ERROR_HLSL_INVALID_TYPE,
+                        "Ternary condition type '%s' is not compatible with value type '%s'.",
+                        cond_string->buffer, value_string->buffer);
+            hlsl_release_string_buffer(ctx, cond_string);
+            hlsl_release_string_buffer(ctx, value_string);
+        }
 
         if (!(first = add_implicit_conversion(ctx, block, first, common_type, &first->loc)))
             return false;
diff --git a/tests/hlsl/ternary.shader_test b/tests/hlsl/ternary.shader_test
index 5f38d896..902d2e11 100644
--- a/tests/hlsl/ternary.shader_test
+++ b/tests/hlsl/ternary.shader_test
@@ -124,7 +124,7 @@ probe all rgba (5.0, 6.0, 7.0, 1.0)
 % * the result operands are scalar;
 % * one is a typeN and the other is a type1xN
 
-[pixel shader fail todo]
+[pixel shader fail]
 
 uniform float4 cond;
 uniform float2x2 a, b;
@@ -135,7 +135,7 @@ float4 main() : sv_target
 }
 
 
-[pixel shader fail todo]
+[pixel shader fail]
 
 uniform float2x2 cond;
 uniform float4 a, b;
@@ -162,7 +162,7 @@ draw quad
 probe all rgba (1.0, 6.0, 7.0, 4.0)
 
 
-[pixel shader fail todo]
+[pixel shader fail]
 
 uniform float3 cond;
 uniform float4 a, b;
@@ -174,7 +174,7 @@ float4 main() : sv_target
 }
 
 
-[pixel shader fail todo]
+[pixel shader fail]
 
 uniform float4 cond;
 uniform float4x1 a, b;