diff --git a/.travis.yml b/.travis.yml
index c5581db..ba1b1bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,3 +20,10 @@ env:
   - SHELL=ksh TEST_SUITE=fast
   - SHELL=ksh TEST_SUITE=fast WITHOUT_CURL=1
   - SHELL=sh TEST_SUITE=slow
+  - SHELL=sh TEST_SUITE=slow WITHOUT_CURL=1
+  - SHELL=dash TEST_SUITE=slow
+  - SHELL=dash TEST_SUITE=slow WITHOUT_CURL=1
+  - SHELL=bash TEST_SUITE=slow
+  - SHELL=bash TEST_SUITE=slow WITHOUT_CURL=1
+  - SHELL=zsh TEST_SUITE=slow
+  - SHELL=zsh TEST_SUITE=slow WITHOUT_CURL=1
diff --git a/install.sh b/install.sh
index d7c6261..53459f7 100755
--- a/install.sh
+++ b/install.sh
@@ -18,7 +18,7 @@ nvm_download() {
     # Emulate curl with wget
     ARGS=$(echo "$*" | sed -e 's/--progress-bar /--progress=bar /' \
                            -e 's/-L //' \
-                           -e 's/-I //' \
+                           -e 's/-I /--server-response /' \
                            -e 's/-s /-q /' \
                            -e 's/-o /-O /' \
                            -e 's/-C - /-c /')
diff --git a/nvm.sh b/nvm.sh
index fee0758..aa46581 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -19,7 +19,7 @@ nvm_download() {
     # Emulate curl with wget
     ARGS=$(echo "$*" | sed -e 's/--progress-bar /--progress=bar /' \
                            -e 's/-L //' \
-                           -e 's/-I //' \
+                           -e 's/-I /--server-response /' \
                            -e 's/-s /-q /' \
                            -e 's/-o /-O /' \
                            -e 's/-C - /-c /')
@@ -449,7 +449,7 @@ nvm() {
       tmpdir="$NVM_DIR/src"
       local tmptarball
       tmptarball="$tmpdir/node-$VERSION.tar.gz"
-      if [ "`nvm_download -s -I "$NVM_NODEJS_ORG_MIRROR/$VERSION/node-$VERSION.tar.gz" -o - | \grep '200 OK'`" != '' ]; then
+      if [ "`nvm_download -s -I "$NVM_NODEJS_ORG_MIRROR/$VERSION/node-$VERSION.tar.gz" -o - 2>&1 | \grep '200 OK'`" != '' ]; then
         tarball="$NVM_NODEJS_ORG_MIRROR/$VERSION/node-$VERSION.tar.gz"
         sum=`nvm_download -s $NVM_NODEJS_ORG_MIRROR/$VERSION/SHASUMS.txt -o - | \grep node-$VERSION.tar.gz | \awk '{print $1}'`
       elif [ "`nvm_download -s -I "$NVM_NODEJS_ORG_MIRROR/node-$VERSION.tar.gz" -o - | \grep '200 OK'`" != '' ]; then