diff --git a/100_core/src/gplx/Decimal_adp__tst.java b/100_core/src/gplx/Decimal_adp__tst.java
index 5ee584dc8..e45393b38 100644
--- a/100_core/src/gplx/Decimal_adp__tst.java
+++ b/100_core/src/gplx/Decimal_adp__tst.java
@@ -16,7 +16,7 @@ Apache License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-APACHE2.txt
 package gplx;
 import org.junit.*;
 public class Decimal_adp__tst {
-	private final Decimal_adp__fxt fxt = new Decimal_adp__fxt();
+	private final    Decimal_adp__fxt fxt = new Decimal_adp__fxt();
 	@Test  public void divide_() {
 		fxt.Test_divide(1, 1000, "0.001");
 		fxt.Test_divide(1, 3, "0.33333333333333");	
@@ -37,6 +37,7 @@ public class Decimal_adp__tst {
 		fxt.Test_parse("1", "1");
 		fxt.Test_parse("1.2", "1.2");
 		fxt.Test_parse("0.1", "0.1");
+		fxt.Test_parse("1.2E1", "12");
 	}
 	@Test  public void Truncate_decimal() {
 		fxt.Test_truncate_decimal("1", "1");
diff --git a/400_xowa/src/gplx/langs/jsons/Json_itm_decimal.java b/400_xowa/src/gplx/langs/jsons/Json_itm_decimal.java
index 8da5c8475..8b6921c4a 100644
--- a/400_xowa/src/gplx/langs/jsons/Json_itm_decimal.java
+++ b/400_xowa/src/gplx/langs/jsons/Json_itm_decimal.java
@@ -24,8 +24,11 @@ public class Json_itm_decimal extends Json_itm_base {
 		return data_bry;
 	}
 	public Decimal_adp Data_as_decimal() {
-		if (data == null)
-			data = Decimal_adp_.parse(String_.new_a7(this.Data_bry()));
+		if (data == null) {
+			String s = String_.new_a7(this.Data_bry());
+			s = String_.Replace(s, "e", "E"); // exponent can be either "e" or "E" in JSON, but Java decimal parse only takes "E"; ISSUE#:565; DATE:2020-03-25
+			data = Decimal_adp_.parse(s);
+		}
 		return data;
 	}
 	@Override public void Print_as_json(Bry_bfr bfr, int depth) {bfr.Add_mid(doc.Src(), this.Src_bgn(), this.Src_end());}
diff --git a/400_xowa/src/gplx/langs/jsons/Json_kv_ary_srl_tst.java b/400_xowa/src/gplx/langs/jsons/Json_kv_ary_srl_tst.java
index 8e553e078..92278b632 100644
--- a/400_xowa/src/gplx/langs/jsons/Json_kv_ary_srl_tst.java
+++ b/400_xowa/src/gplx/langs/jsons/Json_kv_ary_srl_tst.java
@@ -20,6 +20,7 @@ public class Json_kv_ary_srl_tst {
 	@Test   public void Null()					{fxt.Test_parse("{'k0':null}"					, fxt.ary_(fxt.kv_str_("k0", null)));}
 	@Test   public void Bool_n()				{fxt.Test_parse("{'k0':false}"					, fxt.ary_(fxt.kv_bool_("k0", false)));}
 	@Test   public void Num()					{fxt.Test_parse("{'k0':123}"					, fxt.ary_(fxt.kv_int_("k0", 123)));}
+	@Test   public void Num_exp()               {fxt.Test_parse("{'k0':1.23e2}"					, fxt.ary_(fxt.kv_int_("k0", 123)));} // exponent can be either "e" or "E" in JSON, but Java decimal parse only takes "E"; ISSUE#:565; DATE:2020-03-25
 	@Test   public void Str()					{fxt.Test_parse("{'k0':'v0'}"					, fxt.ary_(fxt.kv_str_("k0", "v0")));}
 	@Test   public void Num_dec()				{fxt.Test_parse("{'k0':1.23}"					, fxt.ary_(fxt.kv_dec_("k0", Decimal_adp_.parse("1.23"))));}
 	@Test   public void Ary_int()				{fxt.Test_parse("{'k0':[1,2,3]}"				, fxt.ary_(fxt.kv_obj_("k0", fxt.ary_(fxt.kv_int_("1", 1), fxt.kv_int_("2", 2), fxt.kv_int_("3", 3)))));}