diff --git a/dlls/d3d10/effect.c b/dlls/d3d10/effect.c
index c43f88a2fc4..016e842b1fb 100644
--- a/dlls/d3d10/effect.c
+++ b/dlls/d3d10/effect.c
@@ -2220,9 +2220,48 @@ static struct ID3D10EffectVariable * STDMETHODCALLTYPE d3d10_effect_GetVariableB
 static struct ID3D10EffectVariable * STDMETHODCALLTYPE d3d10_effect_GetVariableBySemantic(ID3D10Effect *iface,
         LPCSTR semantic)
 {
-    FIXME("iface %p, semantic %s stub!\n", iface, debugstr_a(semantic));
+    struct d3d10_effect *This = (struct d3d10_effect *)iface;
+    unsigned int i;
 
-    return NULL;
+    TRACE("iface %p, semantic %s\n", iface, debugstr_a(semantic));
+
+    if (!semantic)
+    {
+        WARN("Invalid semantic specified\n");
+        return (ID3D10EffectVariable *)&null_variable;
+    }
+
+    for (i = 0; i < This->local_buffer_count; ++i)
+    {
+        struct d3d10_effect_variable *l = &This->local_buffers[i];
+        unsigned int j;
+
+        for (j = 0; j < l->type->member_count; ++j)
+        {
+            struct d3d10_effect_variable *v = &l->members[j];
+
+            if (!strcmp(v->semantic, semantic))
+            {
+                TRACE("Returning variable %p.\n", v);
+                return (ID3D10EffectVariable *)v;
+            }
+        }
+    }
+
+    for (i = 0; i < This->local_variable_count; ++i)
+    {
+        struct d3d10_effect_variable *v = &This->local_variables[i];
+
+        if (!strcmp(v->semantic, semantic))
+        {
+            TRACE("Returning variable %p.\n", v);
+            return (ID3D10EffectVariable *)v;
+        }
+    }
+
+    WARN("Invalid semantic specified\n");
+
+    return (ID3D10EffectVariable *)&null_variable;
 }
 
 static struct ID3D10EffectTechnique * STDMETHODCALLTYPE d3d10_effect_GetTechniqueByIndex(ID3D10Effect *iface,