diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2d039df..5fd9b8c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -75,6 +75,22 @@ jobs:
             localoptions: |
               #define DEBUG_TRACE 5
 
+          # Test disabled-by-default options
+          - name: unusual options
+            localoptions: |
+              #define DO_HOST_LOOKUP 1
+              #define DROPBEAR_CLI_ASKPASS_HELPER 1
+              #define LOG_COMMANDS 1
+              #define DROPBEAR_X11FWD 1
+              #define DROPBEAR_CLI_IMMEDIATE_AUTH 1
+              #define DROPBEAR_ENABLE_CBC_MODE 1
+              #define DROPBEAR_ENABLE_GCM_MODE 1
+              #define DROPBEAR_SHA2_512_HMAC 1
+              #define DROPBEAR_DSS 1
+              #define DROPBEAR_SHA1_96_HMAC 1
+              #define DROPBEAR_DH_GROUP16 1
+              #define DROPBEAR_DH_GROUP1 1
+
           # Check off-by-default options don't bitrot
           - name: nondefault options
             nondefault: 1