diff --git a/src/main/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheck.java b/src/main/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheck.java
index 57c3c3460..51a00f9b3 100644
--- a/src/main/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheck.java
+++ b/src/main/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheck.java
@@ -412,8 +412,8 @@ public class HiddenFieldCheck
         // we should not capitalize the first character if the second
         // one is a capital one, since according to JavBeans spec
         // setXYzz() is a setter for XYzz property, not for xYzz one.
-        if (name != null && name.length() > 0
-            && (name.length() > 1 && !Character.isUpperCase(name.charAt(1))))
+        if (name != null && (name.length() == 1
+                || (name.length() > 1 && !Character.isUpperCase(name.charAt(1)))))
         {
             setterName = name.substring(0, 1).toUpperCase() + name.substring(1);
         }
diff --git a/src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheckTest.java b/src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheckTest.java
index a09c7696e..cfe8d998c 100644
--- a/src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheckTest.java
+++ b/src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheckTest.java
@@ -99,6 +99,7 @@ public class HiddenFieldCheckTest
             "253:40: " + getCheckMessage(MSG_KEY, "prop"),
             "267:29: " + getCheckMessage(MSG_KEY, "prop"),
             "278:41: " + getCheckMessage(MSG_KEY, "prop2"),
+            "290:19: " + getCheckMessage(MSG_KEY, "i"),
         };
         verify(checkConfig, getPath("InputHiddenField.java"), expected);
     }
@@ -271,6 +272,7 @@ public class HiddenFieldCheckTest
             "253:40: " + getCheckMessage(MSG_KEY, "prop"),
             "267:29: " + getCheckMessage(MSG_KEY, "prop"),
             "278:41: " + getCheckMessage(MSG_KEY, "prop2"),
+            "290:19: " + getCheckMessage(MSG_KEY, "i"),
         };
         verify(checkConfig, getPath("InputHiddenField.java"), expected);
     }
@@ -348,6 +350,7 @@ public class HiddenFieldCheckTest
             "253:40: " + getCheckMessage(MSG_KEY, "prop"),
             "267:29: " + getCheckMessage(MSG_KEY, "prop"),
             "278:41: " + getCheckMessage(MSG_KEY, "prop2"),
+            "290:19: " + getCheckMessage(MSG_KEY, "i"),
         };
         verify(checkConfig, getPath("InputHiddenField.java"), expected);
     }
diff --git a/src/test/resources/com/puppycrawl/tools/checkstyle/InputHiddenField.java b/src/test/resources/com/puppycrawl/tools/checkstyle/InputHiddenField.java
index 9b58ad44b..7209a2e70 100644
--- a/src/test/resources/com/puppycrawl/tools/checkstyle/InputHiddenField.java
+++ b/src/test/resources/com/puppycrawl/tools/checkstyle/InputHiddenField.java
@@ -281,3 +281,14 @@ enum PropertySetter4 {
         return this;
     }
 }
+
+/** Tests setter for one letter field (issue #730). */
+class OneLetterField
+{
+    int i;
+
+    void setI(int i)
+    {
+        this.i = i;
+    }
+}