diff --git a/dlls/wined3d/directx.c b/dlls/wined3d/directx.c
index 43f445e12dd..45b38323263 100644
--- a/dlls/wined3d/directx.c
+++ b/dlls/wined3d/directx.c
@@ -105,6 +105,7 @@ static const struct {
     {"GL_EXT_blend_equation_separate",      EXT_BLEND_EQUATION_SEPARATE,    0                           },
     {"GL_EXT_blend_func_separate",          EXT_BLEND_FUNC_SEPARATE,        0                           },
     {"GL_EXT_blend_minmax",                 EXT_BLEND_MINMAX,               0                           },
+    {"GL_EXT_blend_subtract",               EXT_BLEND_SUBTRACT,             0                           },
     {"GL_EXT_depth_bounds_test",            EXT_DEPTH_BOUNDS_TEST,          0                           },
     {"GL_EXT_draw_buffers2",                EXT_DRAW_BUFFERS2,              0                           },
     {"GL_EXT_fog_coord",                    EXT_FOG_COORD,                  0                           },
diff --git a/dlls/wined3d/state.c b/dlls/wined3d/state.c
index ad9374d3e3d..85e61deaea8 100644
--- a/dlls/wined3d/state.c
+++ b/dlls/wined3d/state.c
@@ -650,11 +650,11 @@ static void state_blendop(DWORD state, struct wined3d_stateblock *stateblock, st
 
     switch (stateblock->state.render_states[WINED3DRS_BLENDOP])
     {
-        case WINED3DBLENDOP_ADD              : blendEquation = GL_FUNC_ADD_EXT;          break;
-        case WINED3DBLENDOP_SUBTRACT         : blendEquation = GL_FUNC_SUBTRACT;         break;
-        case WINED3DBLENDOP_REVSUBTRACT      : blendEquation = GL_FUNC_REVERSE_SUBTRACT; break;
-        case WINED3DBLENDOP_MIN              : blendEquation = GL_MIN_EXT;               break;
-        case WINED3DBLENDOP_MAX              : blendEquation = GL_MAX_EXT;               break;
+        case WINED3DBLENDOP_ADD:         blendEquation = GL_FUNC_ADD_EXT;              break;
+        case WINED3DBLENDOP_SUBTRACT:    blendEquation = GL_FUNC_SUBTRACT_EXT;         break;
+        case WINED3DBLENDOP_REVSUBTRACT: blendEquation = GL_FUNC_REVERSE_SUBTRACT_EXT; break;
+        case WINED3DBLENDOP_MIN:         blendEquation = GL_MIN_EXT;                   break;
+        case WINED3DBLENDOP_MAX:         blendEquation = GL_MAX_EXT;                   break;
         default:
             FIXME("Unrecognized/Unhandled D3DBLENDOP value %#x.\n",
                     stateblock->state.render_states[WINED3DRS_BLENDOP]);
@@ -662,11 +662,11 @@ static void state_blendop(DWORD state, struct wined3d_stateblock *stateblock, st
 
     switch (stateblock->state.render_states[WINED3DRS_BLENDOPALPHA])
     {
-        case WINED3DBLENDOP_ADD              : blendEquationAlpha = GL_FUNC_ADD_EXT;          break;
-        case WINED3DBLENDOP_SUBTRACT         : blendEquationAlpha = GL_FUNC_SUBTRACT;         break;
-        case WINED3DBLENDOP_REVSUBTRACT      : blendEquationAlpha = GL_FUNC_REVERSE_SUBTRACT; break;
-        case WINED3DBLENDOP_MIN              : blendEquationAlpha = GL_MIN_EXT;               break;
-        case WINED3DBLENDOP_MAX              : blendEquationAlpha = GL_MAX_EXT;               break;
+        case WINED3DBLENDOP_ADD:         blendEquationAlpha = GL_FUNC_ADD_EXT;              break;
+        case WINED3DBLENDOP_SUBTRACT:    blendEquationAlpha = GL_FUNC_SUBTRACT_EXT;         break;
+        case WINED3DBLENDOP_REVSUBTRACT: blendEquationAlpha = GL_FUNC_REVERSE_SUBTRACT_EXT; break;
+        case WINED3DBLENDOP_MIN:         blendEquationAlpha = GL_MIN_EXT;                   break;
+        case WINED3DBLENDOP_MAX:         blendEquationAlpha = GL_MAX_EXT;                   break;
         default:
             FIXME("Unrecognized/Unhandled D3DBLENDOP value %#x\n",
                     stateblock->state.render_states[WINED3DRS_BLENDOPALPHA]);
diff --git a/dlls/wined3d/wined3d_gl.h b/dlls/wined3d/wined3d_gl.h
index fc362a760bd..3e10d12780e 100644
--- a/dlls/wined3d/wined3d_gl.h
+++ b/dlls/wined3d/wined3d_gl.h
@@ -1786,6 +1786,7 @@ typedef enum wined3d_gl_extension
     EXT_BLEND_EQUATION_SEPARATE,
     EXT_BLEND_FUNC_SEPARATE,
     EXT_BLEND_MINMAX,
+    EXT_BLEND_SUBTRACT,
     EXT_DRAW_BUFFERS2,
     EXT_DEPTH_BOUNDS_TEST,
     EXT_FOG_COORD,
@@ -3006,6 +3007,13 @@ typedef void (WINE_GLAPI *PGLFNBLENDFUNCSEPARATEEXTPROC)(GLenum sfactorRGB, GLen
 #endif
 typedef void (WINE_GLAPI *PGLFNBLENDEQUATIONEXTPROC)(GLenum mode);
 
+/* GL_EXT_blend_subtract */
+#ifndef GL_EXT_blend_subtract
+#define GL_EXT_blend_subtract 1
+#define GL_FUNC_SUBTRACT_EXT                                0x800a
+#define GL_FUNC_REVERSE_SUBTRACT_EXT                        0x800b
+#endif
+
 /* GL_EXT_depth_bounds_test */
 #ifndef GL_EXT_depth_bounds_test
 #define GL_EXT_depth_bounds_test 1