diff --git a/cas/aidl/default/Android.bp b/cas/aidl/default/Android.bp
index 6ce568192a..576016ef27 100644
--- a/cas/aidl/default/Android.bp
+++ b/cas/aidl/default/Android.bp
@@ -21,6 +21,7 @@ cc_library_static {
 
     shared_libs: [
         "android.hardware.cas-V1-ndk",
+        "libbase",
         "libbinder_ndk",
         "liblog",
         "libutils",
@@ -48,6 +49,7 @@ cc_defaults {
     ],
     shared_libs: [
         "android.hardware.cas-V1-ndk",
+        "libbase",
         "libbinder_ndk",
         "liblog",
         "libutils",
diff --git a/cas/aidl/default/FactoryLoader.h b/cas/aidl/default/FactoryLoader.h
index 6a562f6875..443ea1fc8b 100644
--- a/cas/aidl/default/FactoryLoader.h
+++ b/cas/aidl/default/FactoryLoader.h
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <android-base/strings.h>
 #include <dirent.h>
 #include <dlfcn.h>
 #include <media/cas/CasAPI.h>
@@ -96,7 +97,7 @@ bool FactoryLoader<T>::findFactoryForScheme(int32_t CA_system_id,
     struct dirent* pEntry;
     while ((pEntry = readdir(pDir))) {
         String8 pluginPath = dirPath + "/" + pEntry->d_name;
-        if (pluginPath.getPathExtension() == ".so") {
+        if (base::EndsWith(pluginPath.c_str(), ".so")) {
             if (loadFactoryForSchemeFromPath(pluginPath, CA_system_id, library, factory)) {
                 mCASystemIdToLibraryPathMap.add(CA_system_id, pluginPath);
                 closedir(pDir);
@@ -135,7 +136,7 @@ bool FactoryLoader<T>::enumeratePlugins(vector<AidlCasPluginDescriptor>* results
     struct dirent* pEntry;
     while ((pEntry = readdir(pDir))) {
         String8 pluginPath = dirPath + "/" + pEntry->d_name;
-        if (pluginPath.getPathExtension() == ".so") {
+        if (base::EndsWith(pluginPath.c_str(), ".so")) {
             queryPluginsFromPath(pluginPath, results);
         }
     }
diff --git a/drm/1.0/default/Android.bp b/drm/1.0/default/Android.bp
index cbdab4ffe0..45aba7b065 100644
--- a/drm/1.0/default/Android.bp
+++ b/drm/1.0/default/Android.bp
@@ -134,6 +134,7 @@ cc_library_shared {
     shared_libs: [
         "android.hardware.drm@1.0",
         "android.hidl.memory@1.0",
+        "libbase",
         "libcutils",
         "libhidlbase",
         "libhidlmemory",
diff --git a/drm/1.0/default/include/PluginLoader.h b/drm/1.0/default/include/PluginLoader.h
index e243f42feb..5130b16826 100644
--- a/drm/1.0/default/include/PluginLoader.h
+++ b/drm/1.0/default/include/PluginLoader.h
@@ -18,6 +18,8 @@
 #define PLUGIN_LOADER_H_
 
 #include "SharedLibrary.h"
+
+#include <android-base/strings.h>
 #include <utils/Log.h>
 #include <utils/String8.h>
 #include <utils/Vector.h>
@@ -46,7 +48,7 @@ class PluginLoader {
             struct dirent* pEntry;
             while ((pEntry = readdir(pDir))) {
                 String8 file(pEntry->d_name);
-                if (file.getPathExtension() == ".so") {
+                if (base::EndsWith(file.c_str(), ".so")) {
                     String8 path = pluginDir + "/" + pEntry->d_name;
                     T *plugin = loadOne(path, entry);
                     if (plugin) {