diff --git a/.travis.yml b/.travis.yml
index cd04032..175b072 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,4 +58,5 @@
       - libevent-dev
 
 script:
+  - deactivate # deactivate host compiler
   - ./travis-ci.sh
diff --git a/test/ddox.sh b/test/ddox.sh
index 44f836e..9675ed8 100755
--- a/test/ddox.sh
+++ b/test/ddox.sh
@@ -2,6 +2,12 @@
 
 . $(dirname "${BASH_SOURCE[0]}")/common.sh
 
+# gdc 4.8.5 not working with ddox due to missing
+# std.experimental.allocator.mallocator for libdparse
+if [ ${DC} = gdc ]; then
+    exit 0
+fi
+
 (cd $CURR_DIR/ddox/default && $DUB build -b ddox)
 grep -qF ddox_project $CURR_DIR/ddox/default/docs/index.html
 
diff --git a/travis-ci.sh b/travis-ci.sh
index 8cf47b3..9046bf3 100755
--- a/travis-ci.sh
+++ b/travis-ci.sh
@@ -2,6 +2,8 @@
 
 set -v -e -o pipefail
 
+source ~/dlang/*/activate # activate host compiler
+
 if [ -z "$FRONTEND" -o "$FRONTEND" \> 2.067.z ]; then
     vibe_ver=$(jq -r '.versions | .["vibe-d"]' < dub.selections.json)
     dub fetch vibe-d --version=$vibe_ver # get optional dependency
@@ -12,10 +14,21 @@
     # library-nonet fails to build with coverage (Issue 13742)
     dub test --compiler=${DC} -b unittest-cov
     ./build.sh -cov
+
+    # run tests with different compilers
+    DUB=`pwd`/bin/dub DC=${DC} test/run-unittest.sh
+    deactivate
+    git clean -dxf -- test
+    source $(~/dlang/install.sh ldc --activate)
+    DUB=`pwd`/bin/dub DC=${DC} test/run-unittest.sh
+    deactivate
+    git clean -dxf -- test
+    source $(~/dlang/install.sh gdc --activate)
+    DUB=`pwd`/bin/dub DC=${DC} test/run-unittest.sh
 else
     ./build.sh
+    DUB=`pwd`/bin/dub DC=${DC} test/run-unittest.sh
 fi
-DUB=`pwd`/bin/dub DC=${DC} test/run-unittest.sh
 
 if [ "$COVERAGE" = true ]; then
     wget https://codecov.io/bash -O codecov.sh