diff --git a/src/dxbc/dxbc_chunk_isgn.cpp b/src/dxbc/dxbc_chunk_isgn.cpp
index 1462dffc..45285014 100644
--- a/src/dxbc/dxbc_chunk_isgn.cpp
+++ b/src/dxbc/dxbc_chunk_isgn.cpp
@@ -10,10 +10,14 @@ namespace dxvk {
       DxbcScalarType::Uint32, DxbcScalarType::Uint32,
       DxbcScalarType::Sint32, DxbcScalarType::Float32,
     };
+
+    // https://github.com/DarkStarSword/3d-fixes/blob/master/dx11shaderanalyse.py#L101
+    bool hasStream    = (tag == "ISG1") || (tag == "OSG1") || (tag == "PSG1") || (tag == "OSG5");
+    bool hasPrecision = (tag == "ISG1") || (tag == "OSG1") || (tag == "PSG1");
     
     for (uint32_t i = 0; i < elementCount; i++) {
       DxbcSgnEntry entry;
-      entry.streamId        = tag == "OSG5" ? reader.readu32() : 0;
+      entry.streamId        = hasStream ? reader.readu32() : 0;
       entry.semanticName    = reader.clone(reader.readu32()).readString();
       entry.semanticIndex   = reader.readu32();
       entry.systemValue     = static_cast<DxbcSystemValue>(reader.readu32());
@@ -21,6 +25,9 @@ namespace dxvk {
       entry.registerId      = reader.readu32();
       entry.componentMask   = bit::extract(reader.readu32(), 0, 3);
 
+      if (hasPrecision)
+        reader.readu32();
+
       m_entries.push_back(entry);
     }
   }
diff --git a/src/dxbc/dxbc_module.cpp b/src/dxbc/dxbc_module.cpp
index e712438d..5eb90cfb 100644
--- a/src/dxbc/dxbc_module.cpp
+++ b/src/dxbc/dxbc_module.cpp
@@ -23,10 +23,10 @@ namespace dxvk {
       if ((tag == "SHDR") || (tag == "SHEX"))
         m_shexChunk = new DxbcShex(chunkReader);
       
-      if ((tag == "ISGN"))
+      if ((tag == "ISGN") || (tag == "ISG1"))
         m_isgnChunk = new DxbcIsgn(chunkReader, tag);
       
-      if ((tag == "OSGN") || (tag == "OSG5"))
+      if ((tag == "OSGN") || (tag == "OSG5") || (tag == "OSG1"))
         m_osgnChunk = new DxbcIsgn(chunkReader, tag);
     }
   }