diff --git a/data/registers/rcc_g4.yaml b/data/registers/rcc_g4.yaml
index fb5e708..ac07c3c 100644
--- a/data/registers/rcc_g4.yaml
+++ b/data/registers/rcc_g4.yaml
@@ -1068,6 +1068,7 @@ fieldset/CFGR:
       description: APB high-speed prescaler (APB2)
       bit_offset: 11
       bit_size: 3
+      enum: PPRE
     - name: MCOSEL
       description: Microcontroller clock output
       bit_offset: 24