diff --git a/embassy-stm32/src/tsc/mod.rs b/embassy-stm32/src/tsc/mod.rs
index ad0f1cca0..4b1987469 100644
--- a/embassy-stm32/src/tsc/mod.rs
+++ b/embassy-stm32/src/tsc/mod.rs
@@ -13,6 +13,11 @@ use crate::pac::tsc::Tsc as Regs;
 use crate::rcc::RccPeripheral;
 use crate::{peripherals, Peripheral};
 
+#[cfg(tsc_v1)]
+const TSC_NUM_GROUPS: u32 = 6;
+#[cfg(tsc_v2)]
+const TSC_NUM_GROUPS: u32 = 7;
+#[cfg(tsc_v3)]
 const TSC_NUM_GROUPS: u32 = 8;
 
 /// Error type defined for TSC