diff --git a/src/locale/nl-be.js b/src/locale/nl-be.js
index d7a8d5429e..d0bde0938b 100644
--- a/src/locale/nl-be.js
+++ b/src/locale/nl-be.js
@@ -9,7 +9,7 @@ var monthsShortWithDots = 'jan._feb._mrt._apr._mei_jun._jul._aug._sep._okt._nov.
     monthsShortWithoutDots = 'jan_feb_mrt_apr_mei_jun_jul_aug_sep_okt_nov_dec'.split('_');
 
 var monthsParse = [/^jan/i, /^feb/i, /^maart|mrt.?$/i, /^apr/i, /^mei$/i, /^jun[i.]?$/i, /^jul[i.]?$/i, /^aug/i, /^sep/i, /^okt/i, /^nov/i, /^dec/i];
-var monthsRegex = /^(januari|februari|maart|april|mei|april|ju[nl]i|augustus|september|oktober|november|december|jan\.?|feb\.?|mrt\.?|apr\.?|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i;
+var monthsRegex = /^(januari|februari|maart|april|mei|ju[nl]i|augustus|september|oktober|november|december|jan\.?|feb\.?|mrt\.?|apr\.?|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i;
 
 export default moment.defineLocale('nl-be', {
     months : 'januari_februari_maart_april_mei_juni_juli_augustus_september_oktober_november_december'.split('_'),
@@ -25,7 +25,7 @@ export default moment.defineLocale('nl-be', {
 
     monthsRegex: monthsRegex,
     monthsShortRegex: monthsRegex,
-    monthsStrictRegex: /^(januari|februari|maart|mei|ju[nl]i|april|augustus|september|oktober|november|december)/i,
+    monthsStrictRegex: /^(januari|februari|maart|april|mei|ju[nl]i|augustus|september|oktober|november|december)/i,
     monthsShortStrictRegex: /^(jan\.?|feb\.?|mrt\.?|apr\.?|mei|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i,
 
     monthsParse : monthsParse,
diff --git a/src/locale/nl.js b/src/locale/nl.js
index 70c9837f22..fcd6a404bf 100644
--- a/src/locale/nl.js
+++ b/src/locale/nl.js
@@ -9,7 +9,7 @@ var monthsShortWithDots = 'jan._feb._mrt._apr._mei_jun._jul._aug._sep._okt._nov.
     monthsShortWithoutDots = 'jan_feb_mrt_apr_mei_jun_jul_aug_sep_okt_nov_dec'.split('_');
 
 var monthsParse = [/^jan/i, /^feb/i, /^maart|mrt.?$/i, /^apr/i, /^mei$/i, /^jun[i.]?$/i, /^jul[i.]?$/i, /^aug/i, /^sep/i, /^okt/i, /^nov/i, /^dec/i];
-var monthsRegex = /^(januari|februari|maart|april|mei|april|ju[nl]i|augustus|september|oktober|november|december|jan\.?|feb\.?|mrt\.?|apr\.?|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i;
+var monthsRegex = /^(januari|februari|maart|april|mei|ju[nl]i|augustus|september|oktober|november|december|jan\.?|feb\.?|mrt\.?|apr\.?|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i;
 
 export default moment.defineLocale('nl', {
     months : 'januari_februari_maart_april_mei_juni_juli_augustus_september_oktober_november_december'.split('_'),
@@ -25,7 +25,7 @@ export default moment.defineLocale('nl', {
 
     monthsRegex: monthsRegex,
     monthsShortRegex: monthsRegex,
-    monthsStrictRegex: /^(januari|februari|maart|mei|ju[nl]i|april|augustus|september|oktober|november|december)/i,
+    monthsStrictRegex: /^(januari|februari|maart|april|mei|ju[nl]i|augustus|september|oktober|november|december)/i,
     monthsShortStrictRegex: /^(jan\.?|feb\.?|mrt\.?|apr\.?|mei|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i,
 
     monthsParse : monthsParse,