diff --git a/lint.go b/lint.go
index af7e2e6..8dbe3ea 100644
--- a/lint.go
+++ b/lint.go
@@ -614,6 +614,12 @@
 			for i+n+1 < len(runes) && runes[i+n+1] == '_' {
 				n++
 			}
+
+			// Leave at most one underscore if the underscore is between two digits
+			if i+n+1 < len(runes) && unicode.IsDigit(runes[i]) && unicode.IsDigit(runes[i+n+1]) {
+				n--
+			}
+
 			copy(runes[i+1:], runes[i+n+1:])
 			runes = runes[:len(runes)-n]
 		} else if unicode.IsLower(runes[i]) && !unicode.IsLower(runes[i+1]) {
diff --git a/lint_test.go b/lint_test.go
index f0a0acc..c169af2 100644
--- a/lint_test.go
+++ b/lint_test.go
@@ -190,6 +190,10 @@
 		{"a__b", "aB"},
 		{"a___b", "aB"},
 		{"Rpc1150", "RPC1150"},
+		{"case3_1", "case3_1"},
+		{"case3__1", "case3_1"},
+		{"IEEE802_16bit", "IEEE802_16bit"},
+		{"IEEE802_16Bit", "IEEE802_16Bit"},
 	}
 	for _, test := range tests {
 		got := lintName(test.name)
diff --git a/testdata/names.go b/testdata/names.go
index 9b2bf17..4e84597 100644
--- a/testdata/names.go
+++ b/testdata/names.go
@@ -71,3 +71,17 @@
 
 	F(foo_bar int) // MATCH /foo_bar.*fooBar/
 }
+
+// All okay; underscore between digits
+const case1_1 = 1
+
+type case2_1 struct {
+	case2_2 int
+}
+
+func case3_1(case3_2 int) (case3_3 string) {
+	case3_4 := 4
+	_ = case3_4
+
+	return ""
+}