diff --git a/contrib/install_db4.sh b/contrib/install_db4.sh
index e9130a21ded67..702b2cd372705 100755
--- a/contrib/install_db4.sh
+++ b/contrib/install_db4.sh
@@ -6,6 +6,8 @@
 # Install libdb4.8 (Berkeley DB).
 
 export LC_ALL=C
+export CFLAGS="-Wno-error=implicit-function-declaration"
+
 set -e
 
 if [ -z "${1}" ]; then
diff --git a/depends/packages/bdb.mk b/depends/packages/bdb.mk
index 06cf974f75c18..af7f3d763615b 100644
--- a/depends/packages/bdb.mk
+++ b/depends/packages/bdb.mk
@@ -10,6 +10,7 @@ define $(package)_set_vars
 $(package)_config_opts=--disable-shared --enable-cxx --disable-replication --enable-option-checking
 $(package)_config_opts_mingw32=--enable-mingw
 $(package)_config_opts_linux=--with-pic
+$(package)_cc+=-Wno-error=implicit-function-declaration
 $(package)_cxxflags=-std=c++11
 $(package)_cppflags_mingw32=-DUNICODE -D_UNICODE
 endef