diff --git a/contrib/base64 b/contrib/base64
index 85b807ff723..5257626d2be 160000
--- a/contrib/base64
+++ b/contrib/base64
@@ -1 +1 @@
-Subproject commit 85b807ff7230adf117575fafc7c99cd7f2992818
+Subproject commit 5257626d2be17a3eb23f79be17fe55ebba394ad2
diff --git a/contrib/base64-cmake/CMakeLists.txt b/contrib/base64-cmake/CMakeLists.txt
index ef2f4c8d052..b8e6fa536a6 100644
--- a/contrib/base64-cmake/CMakeLists.txt
+++ b/contrib/base64-cmake/CMakeLists.txt
@@ -8,8 +8,6 @@ if (ARCH_AMD64)
     add_library(base64_avx2 OBJECT ${LIBRARY_DIR}/turbob64avx2.c)
 endif ()
 
-add_definitions(-DB64CHECK) # Enable full check of incorrect base64 input at decoding.
-
 target_compile_options(base64_scalar PRIVATE -falign-loops)
 
 if (ARCH_AMD64)