diff --git a/tools/cg2glsl.py b/tools/cg2glsl.py
index d8e20efe1e..7f2f341f29 100755
--- a/tools/cg2glsl.py
+++ b/tools/cg2glsl.py
@@ -537,7 +537,7 @@ def preprocess_vertex(source_data):
    input_data = source_data.split('\n')
    ret = []
    for line in input_data:
-      if ('uniform' in line) and ('float4x4' in line):
+      if ('uniform' in line) and (('float4x4' in line) or ('half4x4' in line)):
          ret.append('#pragma pack_matrix(column_major)\n')
          ret.append(line)
          ret.append('#pragma pack_matrix(row_major)\n')