diff --git a/dlls/wined3d/arb_program_shader.c b/dlls/wined3d/arb_program_shader.c
index 3b1eff9c8d8..b1cf6395bec 100644
--- a/dlls/wined3d/arb_program_shader.c
+++ b/dlls/wined3d/arb_program_shader.c
@@ -5054,6 +5054,7 @@ static const SHADER_HANDLER shader_arb_instruction_handler_table[WINED3DSIH_TABL
     /* WINED3DSIH_DCL_FUNCTION_BODY                */ NULL,
     /* WINED3DSIH_DCL_FUNCTION_TABLE               */ NULL,
     /* WINED3DSIH_DCL_GLOBAL_FLAGS                 */ NULL,
+    /* WINED3DSIH_DCL_GS_INSTANCES                 */ NULL,
     /* WINED3DSIH_DCL_HS_FORK_PHASE_INSTANCE_COUNT */ NULL,
     /* WINED3DSIH_DCL_HS_JOIN_PHASE_INSTANCE_COUNT */ NULL,
     /* WINED3DSIH_DCL_HS_MAX_TESSFACTOR            */ NULL,
diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index f875d068801..26554d8c4b9 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -10049,6 +10049,7 @@ static const SHADER_HANDLER shader_glsl_instruction_handler_table[WINED3DSIH_TAB
     /* WINED3DSIH_DCL_FUNCTION_BODY                */ NULL,
     /* WINED3DSIH_DCL_FUNCTION_TABLE               */ NULL,
     /* WINED3DSIH_DCL_GLOBAL_FLAGS                 */ shader_glsl_nop,
+    /* WINED3DSIH_DCL_GS_INSTANCES                 */ NULL,
     /* WINED3DSIH_DCL_HS_FORK_PHASE_INSTANCE_COUNT */ NULL,
     /* WINED3DSIH_DCL_HS_JOIN_PHASE_INSTANCE_COUNT */ NULL,
     /* WINED3DSIH_DCL_HS_MAX_TESSFACTOR            */ NULL,
diff --git a/dlls/wined3d/shader.c b/dlls/wined3d/shader.c
index a29c1f3c18b..c83ef1fd984 100644
--- a/dlls/wined3d/shader.c
+++ b/dlls/wined3d/shader.c
@@ -74,6 +74,7 @@ static const char * const shader_opcode_names[] =
     /* WINED3DSIH_DCL_FUNCTION_BODY                */ "dcl_function_body",
     /* WINED3DSIH_DCL_FUNCTION_TABLE               */ "dcl_function_table",
     /* WINED3DSIH_DCL_GLOBAL_FLAGS                 */ "dcl_globalFlags",
+    /* WINED3DSIH_DCL_GS_INSTANCES                 */ "dcl_gs_instances",
     /* WINED3DSIH_DCL_HS_FORK_PHASE_INSTANCE_COUNT */ "dcl_hs_fork_phase_instance_count",
     /* WINED3DSIH_DCL_HS_JOIN_PHASE_INSTANCE_COUNT */ "dcl_hs_join_phase_instance_count",
     /* WINED3DSIH_DCL_HS_MAX_TESSFACTOR            */ "dcl_hs_max_tessfactor",
@@ -1019,6 +1020,14 @@ static HRESULT shader_get_registers_used(struct wined3d_shader *shader, const st
             else
                 reg_maps->cb_sizes[reg->idx[0].offset] = reg->idx[1].offset;
         }
+        else if (ins.handler_idx == WINED3DSIH_DCL_GS_INSTANCES)
+        {
+            if (shader_version.type == WINED3D_SHADER_TYPE_GEOMETRY)
+                shader->u.gs.instance_count = ins.declaration.count;
+            else
+                FIXME("Invalid instruction %#x for shader type %#x.\n",
+                        ins.handler_idx, shader_version.type);
+        }
         else if (ins.handler_idx == WINED3DSIH_DCL_IMMEDIATE_CONSTANT_BUFFER)
         {
             if (reg_maps->icb)
@@ -2648,11 +2657,12 @@ static void shader_trace_init(const struct wined3d_shader_frontend *fe, void *fe
                 shader_addline(&buffer, ", comparisonMode");
         }
         else if (ins.handler_idx == WINED3DSIH_DCL_TEMPS
-                || ins.handler_idx == WINED3DSIH_DCL_VERTICES_OUT
+                || ins.handler_idx == WINED3DSIH_DCL_GS_INSTANCES
                 || ins.handler_idx == WINED3DSIH_DCL_HS_FORK_PHASE_INSTANCE_COUNT
                 || ins.handler_idx == WINED3DSIH_DCL_HS_JOIN_PHASE_INSTANCE_COUNT
                 || ins.handler_idx == WINED3DSIH_DCL_INPUT_CONTROL_POINT_COUNT
-                || ins.handler_idx == WINED3DSIH_DCL_OUTPUT_CONTROL_POINT_COUNT)
+                || ins.handler_idx == WINED3DSIH_DCL_OUTPUT_CONTROL_POINT_COUNT
+                || ins.handler_idx == WINED3DSIH_DCL_VERTICES_OUT)
         {
             shader_addline(&buffer, "%s %u", shader_opcode_names[ins.handler_idx], ins.declaration.count);
         }
diff --git a/dlls/wined3d/shader_sm4.c b/dlls/wined3d/shader_sm4.c
index c67099661f9..4e0fb8301bc 100644
--- a/dlls/wined3d/shader_sm4.c
+++ b/dlls/wined3d/shader_sm4.c
@@ -294,6 +294,7 @@ enum wined3d_sm4_opcode
     WINED3D_SM5_OP_IMM_ATOMIC_UMAX                  = 0xbc,
     WINED3D_SM5_OP_IMM_ATOMIC_UMIN                  = 0xbd,
     WINED3D_SM5_OP_SYNC                             = 0xbe,
+    WINED3D_SM5_OP_DCL_GS_INSTANCES                 = 0xce,
 };
 
 enum wined3d_sm4_register_type
@@ -1053,6 +1054,8 @@ static const struct wined3d_sm4_opcode_info opcode_table[] =
     {WINED3D_SM5_OP_IMM_ATOMIC_UMIN,                  WINED3DSIH_IMM_ATOMIC_UMIN,                  "uU",   "iu"},
     {WINED3D_SM5_OP_SYNC,                             WINED3DSIH_SYNC,                             "",     "",
             shader_sm5_read_sync},
+    {WINED3D_SM5_OP_DCL_GS_INSTANCES,                 WINED3DSIH_DCL_GS_INSTANCES,                 "",     "",
+            shader_sm4_read_declaration_count},
 };
 
 static const enum wined3d_shader_register_type register_type_table[] =
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index eef7cc89f3b..bab0feae0b6 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -700,6 +700,7 @@ enum WINED3D_SHADER_INSTRUCTION_HANDLER
     WINED3DSIH_DCL_FUNCTION_BODY,
     WINED3DSIH_DCL_FUNCTION_TABLE,
     WINED3DSIH_DCL_GLOBAL_FLAGS,
+    WINED3DSIH_DCL_GS_INSTANCES,
     WINED3DSIH_DCL_HS_FORK_PHASE_INSTANCE_COUNT,
     WINED3DSIH_DCL_HS_JOIN_PHASE_INSTANCE_COUNT,
     WINED3DSIH_DCL_HS_MAX_TESSFACTOR,
@@ -3681,7 +3682,8 @@ struct wined3d_geometry_shader
 {
     enum wined3d_primitive_type input_type;
     enum wined3d_primitive_type output_type;
-    UINT vertices_out;
+    unsigned int vertices_out;
+    unsigned int instance_count;
 
     struct wined3d_stream_output_desc so_desc;
 };