diff --git a/doc/python_api/examples/blf.py b/doc/python_api/examples/blf.py
index 24ac348881f..abcad480aed 100644
--- a/doc/python_api/examples/blf.py
+++ b/doc/python_api/examples/blf.py
@@ -37,7 +37,7 @@ def draw_callback_px(self, context):
     # BLF drawing routine
     font_id = font_info["font_id"]
     blf.position(font_id, 2, 80, 0)
-    blf.size(font_id, 50)
+    blf.size(font_id, 50.0)
     blf.draw(font_id, "Hello World")
 
 
diff --git a/scripts/templates_py/operator_modal_draw.py b/scripts/templates_py/operator_modal_draw.py
index 77371a75605..46c8c1dd242 100644
--- a/scripts/templates_py/operator_modal_draw.py
+++ b/scripts/templates_py/operator_modal_draw.py
@@ -11,7 +11,7 @@ def draw_callback_px(self, context):
 
     # draw some text
     blf.position(font_id, 15, 30, 0)
-    blf.size(font_id, 20, 72)
+    blf.size(font_id, 20.0)
     blf.draw(font_id, "Hello Word " + str(len(self.mouse_path)))
 
     # 50% alpha, 2 pixel width line
diff --git a/source/blender/python/generic/blf_py_api.c b/source/blender/python/generic/blf_py_api.c
index bd86dea082b..47a2289f87c 100644
--- a/source/blender/python/generic/blf_py_api.c
+++ b/source/blender/python/generic/blf_py_api.c
@@ -61,18 +61,13 @@ PyDoc_STRVAR(py_blf_size_doc,
              "   :type dpi: int\n");
 static PyObject *py_blf_size(PyObject *UNUSED(self), PyObject *args)
 {
-  int fontid, dpi = -1;
+  int fontid;
   float size;
 
-  if (!PyArg_ParseTuple(args, "if|i:blf.size", &fontid, &size, &dpi)) {
+  if (!PyArg_ParseTuple(args, "if:blf.size", &fontid, &size)) {
     return NULL;
   }
 
-  if (dpi != -1) {
-    size *= (float)dpi / 72.0f;
-    PyErr_WarnEx(PyExc_DeprecationWarning, "'dpi' is deprecated and assumed to be always 72.", 1);
-  }
-
   BLF_size(fontid, size);
 
   Py_RETURN_NONE;