diff --git a/.gitignore b/.gitignore
index eb5a316..c507849 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 target
+.idea
diff --git a/src/main/java/com/github/shyiko/skedule/internal/ScheduleImpl.kt b/src/main/java/com/github/shyiko/skedule/internal/ScheduleImpl.kt
index 16eca13..560280d 100644
--- a/src/main/java/com/github/shyiko/skedule/internal/ScheduleImpl.kt
+++ b/src/main/java/com/github/shyiko/skedule/internal/ScheduleImpl.kt
@@ -1,19 +1,11 @@
 package com.github.shyiko.skedule.internal
 
-import com.github.shyiko.skedule.InvalidScheduleException
-import com.github.shyiko.skedule.Schedule
-import java.lang.AssertionError
-import java.time.DayOfWeek
-import java.time.Duration
-import java.time.LocalTime
-import java.time.Month
-import java.time.ZonedDateTime
-import java.time.format.DateTimeFormatterBuilder
-import java.time.temporal.ChronoField
-import java.time.temporal.ChronoUnit
-import java.time.temporal.TemporalAdjusters
-import java.util.EnumSet
-import java.util.concurrent.TimeUnit
+import com.github.shyiko.skedule.*
+import java.time.*
+import java.time.format.*
+import java.time.temporal.*
+import java.util.*
+import java.util.concurrent.*
 
 internal object ScheduleImpl {
 
@@ -168,7 +160,7 @@ internal object ScheduleImpl {
                         rawOrdinal.split(',').flatMapTo(mutableSetOf<Int>()) {
                             if (it.contains('-')) parseOrdinalRange(it, 1, 31) else setOf(parseOrdinal(it))
                         },
-                    months = if (month == "") MONTH_ALL else
+                    months = if (month == "month") MONTH_ALL else
                         EnumSet.copyOf(month.split(',').flatMap {
                             if (it.contains('-')) parseMonthRange(it) else setOf(parseMonth(it))
                         }),
diff --git a/src/test/java/com/github/shyiko/skedule/ScheduleTest.kt b/src/test/java/com/github/shyiko/skedule/ScheduleTest.kt
index 3a5f9f8..0386cca 100644
--- a/src/test/java/com/github/shyiko/skedule/ScheduleTest.kt
+++ b/src/test/java/com/github/shyiko/skedule/ScheduleTest.kt
@@ -1,12 +1,9 @@
 package com.github.shyiko.skedule
 
-import org.assertj.core.api.Assertions.assertThat
-import org.testng.annotations.Test
-import java.time.DayOfWeek
-import java.time.LocalTime
-import java.time.Month
-import java.time.ZonedDateTime
-import java.time.format.DateTimeFormatter
+import org.assertj.core.api.Assertions.*
+import org.testng.annotations.*
+import java.time.*
+import java.time.format.*
 
 class ScheduleTest {
 
@@ -213,6 +210,21 @@ class ScheduleTest {
         ))
     }
 
+    @Test
+    fun testEveryMonth() {
+        assertThat(
+            iterateOverSchedule(
+                "1st monday of month 09:00",
+                ZonedDateTime.parse("2018-01-01T00:00:00.007Z"),
+                skipFirstIfSame = false
+            )
+        ).isEqualTo(listOf(
+            "2018-01-01T09:00:00Z",
+            "2018-02-05T09:00:00Z",
+            "2018-03-05T09:00:00Z"
+        ))
+    }
+
     @Test
     fun testHourAlias() {
         assertThat(