diff --git a/dlls/wined3d/arb_program_shader.c b/dlls/wined3d/arb_program_shader.c
index 3976c19563f..508f927be13 100644
--- a/dlls/wined3d/arb_program_shader.c
+++ b/dlls/wined3d/arb_program_shader.c
@@ -5309,6 +5309,7 @@ static const SHADER_HANDLER shader_arb_instruction_handler_table[WINED3DSIH_TABL
     /* WINED3DSIH_IMM_ATOMIC_CONSUME               */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_EXCH                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_OR                    */ NULL,
+    /* WINED3DSIH_IMM_ATOMIC_UMAX                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_XOR                   */ NULL,
     /* WINED3DSIH_IMUL                             */ NULL,
     /* WINED3DSIH_INE                              */ NULL,
diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index b446659a429..45c53b629c9 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -8972,6 +8972,7 @@ static const SHADER_HANDLER shader_glsl_instruction_handler_table[WINED3DSIH_TAB
     /* WINED3DSIH_IMM_ATOMIC_CONSUME               */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_EXCH                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_OR                    */ NULL,
+    /* WINED3DSIH_IMM_ATOMIC_UMAX                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_XOR                   */ NULL,
     /* WINED3DSIH_IMUL                             */ shader_glsl_imul,
     /* WINED3DSIH_INE                              */ shader_glsl_relop,
diff --git a/dlls/wined3d/shader.c b/dlls/wined3d/shader.c
index e070d690f0b..bb2a2131a2c 100644
--- a/dlls/wined3d/shader.c
+++ b/dlls/wined3d/shader.c
@@ -150,6 +150,7 @@ static const char * const shader_opcode_names[] =
     /* WINED3DSIH_IMM_ATOMIC_CONSUME               */ "imm_atomic_consume",
     /* WINED3DSIH_IMM_ATOMIC_EXCH                  */ "imm_atomic_exch",
     /* WINED3DSIH_IMM_ATOMIC_OR                    */ "imm_atomic_or",
+    /* WINED3DSIH_IMM_ATOMIC_UMAX                  */ "imm_atomic_umax",
     /* WINED3DSIH_IMM_ATOMIC_XOR                   */ "imm_atomic_xor",
     /* WINED3DSIH_IMUL                             */ "imul",
     /* WINED3DSIH_INE                              */ "ine",
diff --git a/dlls/wined3d/shader_sm4.c b/dlls/wined3d/shader_sm4.c
index 6d8a0dbb33a..11b17a6413f 100644
--- a/dlls/wined3d/shader_sm4.c
+++ b/dlls/wined3d/shader_sm4.c
@@ -265,6 +265,7 @@ enum wined3d_sm4_opcode
     WINED3D_SM5_OP_IMM_ATOMIC_XOR                   = 0xb7,
     WINED3D_SM5_OP_IMM_ATOMIC_EXCH                  = 0xb8,
     WINED3D_SM5_OP_IMM_ATOMIC_CMP_EXCH              = 0xb9,
+    WINED3D_SM5_OP_IMM_ATOMIC_UMAX                  = 0xbc,
     WINED3D_SM5_OP_SYNC                             = 0xbe,
 };
 
@@ -921,6 +922,7 @@ static const struct wined3d_sm4_opcode_info opcode_table[] =
     {WINED3D_SM5_OP_IMM_ATOMIC_XOR,                   WINED3DSIH_IMM_ATOMIC_XOR,                   "uU",   "iu"},
     {WINED3D_SM5_OP_IMM_ATOMIC_EXCH,                  WINED3DSIH_IMM_ATOMIC_EXCH,                  "uU",   "iu"},
     {WINED3D_SM5_OP_IMM_ATOMIC_CMP_EXCH,              WINED3DSIH_IMM_ATOMIC_CMP_EXCH,              "uU",   "iuu"},
+    {WINED3D_SM5_OP_IMM_ATOMIC_UMAX,                  WINED3DSIH_IMM_ATOMIC_UMAX,                  "uU",   "iu"},
     {WINED3D_SM5_OP_SYNC,                             WINED3DSIH_SYNC,                             "",     "",
             shader_sm5_read_sync},
 };
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 4610a7c2a29..3ece139f9dc 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -676,6 +676,7 @@ enum WINED3D_SHADER_INSTRUCTION_HANDLER
     WINED3DSIH_IMM_ATOMIC_CONSUME,
     WINED3DSIH_IMM_ATOMIC_EXCH,
     WINED3DSIH_IMM_ATOMIC_OR,
+    WINED3DSIH_IMM_ATOMIC_UMAX,
     WINED3DSIH_IMM_ATOMIC_XOR,
     WINED3DSIH_IMUL,
     WINED3DSIH_INE,