diff --git a/lib/libvips.js b/lib/libvips.js
index 4f5fed1c..bc0ea25f 100644
--- a/lib/libvips.js
+++ b/lib/libvips.js
@@ -8,7 +8,8 @@ const semver = require('semver');
 const platform = require('./platform');
 
 const env = process.env;
-const minimumLibvipsVersion = env.npm_package_config_libvips || require('../package.json').config.libvips;
+const minimumLibvipsVersion = env.npm_package_config_libvips || /* istanbul ignore next */
+  require('../package.json').config.libvips;
 
 const spawnSyncOptions = {
   encoding: 'utf8',
@@ -19,6 +20,7 @@ const mkdirSync = function (dirPath) {
   try {
     fs.mkdirSync(dirPath);
   } catch (err) {
+    /* istanbul ignore if */
     if (err.code !== 'EEXIST') {
       throw err;
     }
@@ -26,7 +28,8 @@ const mkdirSync = function (dirPath) {
 };
 
 const cachePath = function () {
-  const npmCachePath = env.npm_config_cache || (env.APPDATA ? path.join(env.APPDATA, 'npm-cache') : path.join(os.homedir(), '.npm'));
+  const npmCachePath = env.npm_config_cache || /* istanbul ignore next */
+    (env.APPDATA ? path.join(env.APPDATA, 'npm-cache') : path.join(os.homedir(), '.npm'));
   mkdirSync(npmCachePath);
   const libvipsCachePath = path.join(npmCachePath, '_libvips');
   mkdirSync(libvipsCachePath);
@@ -51,17 +54,21 @@ const hasVendoredLibvips = function () {
     vendorVersionId = require(path.join(vendorPath, 'versions.json')).vips;
     vendorPlatformId = require(path.join(vendorPath, 'platform.json'));
   } catch (err) {}
+  /* istanbul ignore if */
   if (vendorVersionId && vendorVersionId !== minimumLibvipsVersion) {
     throw new Error(`Found vendored libvips v${vendorVersionId} but require v${minimumLibvipsVersion}. Please remove the 'node_modules/sharp/vendor' directory and run 'npm install'.`);
   }
+  /* istanbul ignore else */
   if (vendorPlatformId) {
+    /* istanbul ignore else */
     if (currentPlatformId === vendorPlatformId) {
       return true;
     } else {
       throw new Error(`'${vendorPlatformId}' binaries cannot be used on the '${currentPlatformId}' platform. Please remove the 'node_modules/sharp/vendor' directory and run 'npm install'.`);
     }
+  } else {
+    return false;
   }
-  return false;
 };
 
 const pkgConfigPath = function () {
@@ -81,7 +88,8 @@ const useGlobalLibvips = function () {
   }
 
   const globalVipsVersion = globalLibvipsVersion();
-  return !!globalVipsVersion && semver.gte(globalVipsVersion, minimumLibvipsVersion);
+  return !!globalVipsVersion && /* istanbul ignore next */
+    semver.gte(globalVipsVersion, minimumLibvipsVersion);
 };
 
 module.exports = {