diff --git a/pyocd/target/family/__init__.py b/pyocd/target/family/__init__.py
index 2e5a747e1..58858e426 100644
--- a/pyocd/target/family/__init__.py
+++ b/pyocd/target/family/__init__.py
@@ -38,7 +38,7 @@ class FamilyInfo(NamedTuple):
 # present), or the 'Dname' or 'Dvariant' part numbers. The comparisons are performed in order from
 # specific to general, starting with the part number.
 FAMILIES = [
-    FamilyInfo("NXP",                   re.compile(r'LPC55?[0-9]{2}.*'),    target_lpc5500.LPC5500Family    ),
+    FamilyInfo("NXP",                   re.compile(r'LPC55.?[0-9]{2}.*'),   target_lpc5500.LPC5500Family    ),
     FamilyInfo("NXP",                   re.compile(r'MIMXRT[0-9]{4}.*'),    target_imxrt.IMXRT              ),
     FamilyInfo("NXP",                   re.compile(r'MK[LEVWS]?.*'),        target_kinetis.Kinetis          ),
     FamilyInfo("Nordic Semiconductor",  re.compile(r'nRF52[0-9]+.*'),       target_nRF52.NRF52              ),