diff --git a/projects/bls-signatures/build.sh b/projects/bls-signatures/build.sh
index f1d013c4c..eec785289 100755
--- a/projects/bls-signatures/build.sh
+++ b/projects/bls-signatures/build.sh
@@ -31,9 +31,6 @@ CFLAGS="" CXXFLAGS="" ./bootstrap.sh
 CFLAGS="" CXXFLAGS="" ./b2 headers
 cp -R boost/ /usr/include/
 
-# Prevent Boost compilation error with -std=c++17
-export CXXFLAGS="$CXXFLAGS -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR"
-
 # Configure Cryptofuzz
 cd $SRC/cryptofuzz/
 python gen_repository.py
diff --git a/projects/cryptofuzz/build.sh b/projects/cryptofuzz/build.sh
index 9aa3c948b..b52b70500 100755
--- a/projects/cryptofuzz/build.sh
+++ b/projects/cryptofuzz/build.sh
@@ -50,9 +50,6 @@ go get golang.org/x/crypto/ripemd160
 # This enables runtime checks for C++-specific undefined behaviour.
 export CXXFLAGS="$CXXFLAGS -D_GLIBCXX_DEBUG"
 
-# Prevent Boost compilation error with -std=c++17
-export CXXFLAGS="$CXXFLAGS -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR"
-
 export CXXFLAGS="$CXXFLAGS -I $SRC/cryptofuzz/fuzzing-headers/include"
 if [[ $CFLAGS = *sanitize=memory* ]]
 then
diff --git a/projects/libecc/build.sh b/projects/libecc/build.sh
index 8b01cc0e6..fd0d42f35 100755
--- a/projects/libecc/build.sh
+++ b/projects/libecc/build.sh
@@ -26,9 +26,6 @@ CFLAGS="" CXXFLAGS="" ./bootstrap.sh
 CFLAGS="" CXXFLAGS="" ./b2 headers
 cp -R boost/ /usr/include/
 
-# Prevent Boost compilation error with -std=c++17
-export CXXFLAGS="$CXXFLAGS -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR"
-
 # Build libecc
 cd $SRC/libecc
 git checkout cryptofuzz
diff --git a/projects/libressl/build.sh b/projects/libressl/build.sh
index 48cf9599c..5c639e63f 100755
--- a/projects/libressl/build.sh
+++ b/projects/libressl/build.sh
@@ -24,9 +24,6 @@ CFLAGS="" CXXFLAGS="" ./bootstrap.sh
 CFLAGS="" CXXFLAGS="" ./b2 headers
 cp -R boost/ /usr/include/
 
-# Prevent Boost compilation error with -std=c++17
-export CXXFLAGS="$CXXFLAGS -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR"
-
 mkdir -p $WORK/libressl
 cd $WORK/libressl
 
diff --git a/projects/relic/build.sh b/projects/relic/build.sh
index 13359d633..8093dffbc 100755
--- a/projects/relic/build.sh
+++ b/projects/relic/build.sh
@@ -26,9 +26,6 @@ CFLAGS="" CXXFLAGS="" ./bootstrap.sh
 CFLAGS="" CXXFLAGS="" ./b2 headers
 cp -R boost/ /usr/include/
 
-# Prevent Boost compilation error with -std=c++17
-export CXXFLAGS="$CXXFLAGS -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR"
-
 # Build Relic
 cd $SRC/relic/
 mkdir build/