diff --git a/changelog.md b/changelog.md
index c0f1ee0b8e..6c3bc018be 100644
--- a/changelog.md
+++ b/changelog.md
@@ -122,6 +122,9 @@
 - ``case object`` branch transitions via ``system.reset`` are deprecated.
   Compile your code with ``-d:nimOldCaseObjects`` for a transition period.
 
+- base64 module: The default parameter `newLine` for the `encode` procs
+  was changed from `"\13\10"` to the empty string `""`.
+
 
 #### Breaking changes in the compiler
 
diff --git a/lib/pure/base64.nim b/lib/pure/base64.nim
index 5985592ff4..0d1839c705 100644
--- a/lib/pure/base64.nim
+++ b/lib/pure/base64.nim
@@ -110,7 +110,7 @@ template encodeInternal(s: typed, lineLen: int, newLine: string): untyped =
     #assert(r == result.len)
     discard
 
-proc encode*[T:SomeInteger|char](s: openarray[T], lineLen = 75, newLine="\13\10"): string =
+proc encode*[T:SomeInteger|char](s: openarray[T], lineLen = 75, newLine=""): string =
   ## Encodes ``s`` into base64 representation. After ``lineLen`` characters, a
   ## ``newline`` is added.
   ##
@@ -126,7 +126,7 @@ proc encode*[T:SomeInteger|char](s: openarray[T], lineLen = 75, newLine="\13\10"
     assert encode([1, 2, 3, 4, 5]) == "AQIDBAU="
   encodeInternal(s, lineLen, newLine)
 
-proc encode*(s: string, lineLen = 75, newLine="\13\10"): string =
+proc encode*(s: string, lineLen = 75, newLine=""): string =
   ## Encodes ``s`` into base64 representation. After ``lineLen`` characters, a
   ## ``newline`` is added.
   ##