diff --git a/.travis.yml b/.travis.yml
index edc000f7ff..793dbe23b0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,19 @@ before_install:
 matrix:
   include:
     - rust: stable
-      env: DO_FUZZ=true
+      env: >-
+          DO_FUZZ=true
+          EXTRA_FEATURES="siphasher"
     - rust: beta
+      env: >-
+          EXTRA_FEATURES="siphasher"
     - rust: nightly
-      env: DO_BENCH=true
+      env: >-
+          DO_BENCH=true
+          EXTRA_FEATURES="siphasher"
+    - rust: 1.26.0
+      env: >-
+          EXTRA_FEATURES="siphasher"
     - rust: 1.22.0
 
 script:
diff --git a/contrib/test.sh b/contrib/test.sh
index bdab18488d..2901f3d9c0 100755
--- a/contrib/test.sh
+++ b/contrib/test.sh
@@ -1,6 +1,6 @@
 #!/bin/sh -ex
 
-FEATURES="bitcoinconsensus use-serde serde-decimal"
+FEATURES="bitcoinconsensus use-serde serde-decimal $EXTRA_FEATURES"
 
 # Use toolchain if explicitly specified
 if [ -n "$TOOLCHAIN" ]