diff --git a/lib/api-client.js b/lib/api-client.js
index e2bb275fb..d3d72847a 100644
--- a/lib/api-client.js
+++ b/lib/api-client.js
@@ -40,10 +40,7 @@ var DisallowedAPIVersionReason;
 const getApiClient = function (apiDetails, { allowExternal = false } = {}) {
     const auth = (allowExternal && apiDetails.externalRepoAuth) || apiDetails.auth;
     const retryingOctokit = githubUtils.GitHub.plugin(retry.retry);
-    let apiURL = apiDetails.apiURL;
-    if (!apiURL) {
-        apiURL = deriveApiUrl(apiDetails.url);
-    }
+    const apiURL = apiDetails.apiURL || deriveApiUrl(apiDetails.url);
     return new retryingOctokit(githubUtils.getOctokitOptions(auth, {
         baseUrl: apiURL,
         userAgent: `CodeQL-${(0, util_1.getMode)()}/${pkg.version}`,
diff --git a/lib/api-client.js.map b/lib/api-client.js.map
index 3afd5f8e7..8f9f9960a 100644
--- a/lib/api-client.js.map
+++ b/lib/api-client.js.map
@@ -1 +1 @@
-{"version":3,"file":"api-client.js","sourceRoot":"","sources":["../src/api-client.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;AAAA,2CAA6B;AAE7B,uEAAyD;AACzD,6DAA+C;AAC/C,0EAAgD;AAEhD,iDAAkD;AAClD,6CAA+B;AAC/B,iCAAqE;AAErE,8CAA8C;AAC9C,MAAM,GAAG,GAAG,OAAO,CAAC,iBAAiB,CAAC,CAAC;AAEvC,IAAY,0BAGX;AAHD,WAAY,0BAA0B;IACpC,+FAAc,CAAA;IACd,+FAAc,CAAA;AAChB,CAAC,EAHW,0BAA0B,GAA1B,kCAA0B,KAA1B,kCAA0B,QAGrC;AAiBM,MAAM,YAAY,GAAG,UAC1B,UAAoC,EACpC,EAAE,aAAa,GAAG,KAAK,EAAE,GAAG,EAAE;IAE9B,MAAM,IAAI,GACR,CAAC,aAAa,IAAI,UAAU,CAAC,gBAAgB,CAAC,IAAI,UAAU,CAAC,IAAI,CAAC;IACpE,MAAM,eAAe,GAAG,WAAW,CAAC,MAAM,CAAC,MAAM,CAAC,KAAK,CAAC,KAAK,CAAC,CAAC;IAC/D,IAAI,MAAM,GAAG,UAAU,CAAC,MAAM,CAAC;IAC/B,IAAI,CAAC,MAAM,EAAE;QACX,MAAM,GAAG,YAAY,CAAC,UAAU,CAAC,GAAG,CAAC,CAAC;KACvC;IACD,OAAO,IAAI,eAAe,CACxB,WAAW,CAAC,iBAAiB,CAAC,IAAI,EAAE;QAClC,OAAO,EAAE,MAAM;QACf,SAAS,EAAE,UAAU,IAAA,cAAO,GAAE,IAAI,GAAG,CAAC,OAAO,EAAE;QAC/C,GAAG,EAAE,IAAA,2BAAe,EAAC,EAAE,KAAK,EAAE,OAAO,EAAE,CAAC;KACzC,CAAC,CACH,CAAC;AACJ,CAAC,CAAC;AAlBW,QAAA,YAAY,gBAkBvB;AAEF,2IAA2I;AAC3I,SAAS,YAAY,CAAC,SAAiB;IACrC,MAAM,GAAG,GAAG,IAAI,GAAG,CAAC,SAAS,CAAC,CAAC;IAE/B,uDAAuD;IACvD,0CAA0C;IAC1C,IAAI,GAAG,CAAC,QAAQ,KAAK,YAAY,IAAI,GAAG,CAAC,QAAQ,KAAK,gBAAgB,EAAE;QACtE,OAAO,wBAAwB,CAAC;KACjC;IAED,6BAA6B;IAC7B,GAAG,CAAC,QAAQ,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,QAAQ,EAAE,KAAK,EAAE,IAAI,CAAC,CAAC;IACpD,OAAO,GAAG,CAAC,QAAQ,EAAE,CAAC;AACxB,CAAC;AAED,SAAS,aAAa;IACpB,OAAO;QACL,IAAI,EAAE,IAAA,+BAAgB,EAAC,OAAO,CAAC;QAC/B,GAAG,EAAE,IAAA,0BAAmB,EAAC,mBAAmB,CAAC;QAC7C,MAAM,EAAE,IAAA,0BAAmB,EAAC,gBAAgB,CAAC;KAC9C,CAAC;AACJ,CAAC;AAED,uFAAuF;AACvF,qFAAqF;AACrF,+CAA+C;AAC/C,SAAgB,mBAAmB;IACjC,OAAO,IAAA,oBAAY,EAAC,aAAa,EAAE,CAAC,CAAC;AACvC,CAAC;AAFD,kDAEC;AAED,IAAI,mBAAmB,GAA8B,SAAS,CAAC;AAE/D;;;;;;;GAOG;AACI,KAAK,UAAU,2BAA2B;IAC/C,IAAI,CAAC,IAAI,CAAC,SAAS,EAAE,EAAE;QACrB,MAAM,IAAI,KAAK,CAAC,uDAAuD,CAAC,CAAC;KAC1E;IACD,IAAI,mBAAmB,KAAK,SAAS,EAAE;QACrC,mBAAmB,GAAG,MAAM,IAAI,CAAC,gBAAgB,CAAC,aAAa,EAAE,CAAC,CAAC;KACpE;IACD,OAAO,mBAAmB,CAAC;AAC7B,CAAC;AARD,kEAQC"}
\ No newline at end of file
+{"version":3,"file":"api-client.js","sourceRoot":"","sources":["../src/api-client.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;AAAA,2CAA6B;AAE7B,uEAAyD;AACzD,6DAA+C;AAC/C,0EAAgD;AAEhD,iDAAkD;AAClD,6CAA+B;AAC/B,iCAAqE;AAErE,8CAA8C;AAC9C,MAAM,GAAG,GAAG,OAAO,CAAC,iBAAiB,CAAC,CAAC;AAEvC,IAAY,0BAGX;AAHD,WAAY,0BAA0B;IACpC,+FAAc,CAAA;IACd,+FAAc,CAAA;AAChB,CAAC,EAHW,0BAA0B,GAA1B,kCAA0B,KAA1B,kCAA0B,QAGrC;AAiBM,MAAM,YAAY,GAAG,UAC1B,UAAoC,EACpC,EAAE,aAAa,GAAG,KAAK,EAAE,GAAG,EAAE;IAE9B,MAAM,IAAI,GACR,CAAC,aAAa,IAAI,UAAU,CAAC,gBAAgB,CAAC,IAAI,UAAU,CAAC,IAAI,CAAC;IACpE,MAAM,eAAe,GAAG,WAAW,CAAC,MAAM,CAAC,MAAM,CAAC,KAAK,CAAC,KAAK,CAAC,CAAC;IAC/D,MAAM,MAAM,GAAG,UAAU,CAAC,MAAM,IAAI,YAAY,CAAC,UAAU,CAAC,GAAG,CAAC,CAAC;IACjE,OAAO,IAAI,eAAe,CACxB,WAAW,CAAC,iBAAiB,CAAC,IAAI,EAAE;QAClC,OAAO,EAAE,MAAM;QACf,SAAS,EAAE,UAAU,IAAA,cAAO,GAAE,IAAI,GAAG,CAAC,OAAO,EAAE;QAC/C,GAAG,EAAE,IAAA,2BAAe,EAAC,EAAE,KAAK,EAAE,OAAO,EAAE,CAAC;KACzC,CAAC,CACH,CAAC;AACJ,CAAC,CAAC;AAfW,QAAA,YAAY,gBAevB;AAEF,2IAA2I;AAC3I,SAAS,YAAY,CAAC,SAAiB;IACrC,MAAM,GAAG,GAAG,IAAI,GAAG,CAAC,SAAS,CAAC,CAAC;IAE/B,uDAAuD;IACvD,0CAA0C;IAC1C,IAAI,GAAG,CAAC,QAAQ,KAAK,YAAY,IAAI,GAAG,CAAC,QAAQ,KAAK,gBAAgB,EAAE;QACtE,OAAO,wBAAwB,CAAC;KACjC;IAED,6BAA6B;IAC7B,GAAG,CAAC,QAAQ,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,QAAQ,EAAE,KAAK,EAAE,IAAI,CAAC,CAAC;IACpD,OAAO,GAAG,CAAC,QAAQ,EAAE,CAAC;AACxB,CAAC;AAED,SAAS,aAAa;IACpB,OAAO;QACL,IAAI,EAAE,IAAA,+BAAgB,EAAC,OAAO,CAAC;QAC/B,GAAG,EAAE,IAAA,0BAAmB,EAAC,mBAAmB,CAAC;QAC7C,MAAM,EAAE,IAAA,0BAAmB,EAAC,gBAAgB,CAAC;KAC9C,CAAC;AACJ,CAAC;AAED,uFAAuF;AACvF,qFAAqF;AACrF,+CAA+C;AAC/C,SAAgB,mBAAmB;IACjC,OAAO,IAAA,oBAAY,EAAC,aAAa,EAAE,CAAC,CAAC;AACvC,CAAC;AAFD,kDAEC;AAED,IAAI,mBAAmB,GAA8B,SAAS,CAAC;AAE/D;;;;;;;GAOG;AACI,KAAK,UAAU,2BAA2B;IAC/C,IAAI,CAAC,IAAI,CAAC,SAAS,EAAE,EAAE;QACrB,MAAM,IAAI,KAAK,CAAC,uDAAuD,CAAC,CAAC;KAC1E;IACD,IAAI,mBAAmB,KAAK,SAAS,EAAE;QACrC,mBAAmB,GAAG,MAAM,IAAI,CAAC,gBAAgB,CAAC,aAAa,EAAE,CAAC,CAAC;KACpE;IACD,OAAO,mBAAmB,CAAC;AAC7B,CAAC;AARD,kEAQC"}
\ No newline at end of file
diff --git a/src/api-client.ts b/src/api-client.ts
index 5611fc858..59cfa764a 100644
--- a/src/api-client.ts
+++ b/src/api-client.ts
@@ -38,10 +38,7 @@ export const getApiClient = function (
   const auth =
     (allowExternal && apiDetails.externalRepoAuth) || apiDetails.auth;
   const retryingOctokit = githubUtils.GitHub.plugin(retry.retry);
-  let apiURL = apiDetails.apiURL;
-  if (!apiURL) {
-    apiURL = deriveApiUrl(apiDetails.url);
-  }
+  const apiURL = apiDetails.apiURL || deriveApiUrl(apiDetails.url);
   return new retryingOctokit(
     githubUtils.getOctokitOptions(auth, {
       baseUrl: apiURL,