diff --git a/jwt_full.nimble b/jwt_full.nimble
index ef161bc..b17239c 100644
--- a/jwt_full.nimble
+++ b/jwt_full.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.3.0"
+version       = "0.4.0"
 author        = "Jonathan Bernard"
 description   = "Full JWT, JWS, JWE, and JWK implementation for Nim, compliant with RFCs 7515-7519."
 license       = "GPL-3.0-or-later"
diff --git a/src/main/jwt_full/private/crypto/pem.nim b/src/main/jwt_full/private/crypto/pem.nim
index da6f42d..13b0ff4 100644
--- a/src/main/jwt_full/private/crypto/pem.nim
+++ b/src/main/jwt_full/private/crypto/pem.nim
@@ -3,7 +3,7 @@ import bearssl
 # Taken from  nim-bearssl/decls.nim
 {.pragma: bearSslFunc, cdecl, gcsafe, noSideEffect, raises: [].}
 
-type BearPemDecoderCallback* = proc(destCtx: pointer, src: pointer, dataLen: uint) {.bearSslFunc.}
+type BearPemDecoderCallback* = proc(destCtx: pointer, src: pointer, dataLen: csize_t) {.bearSslFunc.}
 
 proc decodePem*(
     pem: string,