diff --git a/src/exception.cpp b/src/exception.cpp
index 7cb010d..e9f1da1 100644
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -57,30 +57,30 @@ sys_error::sys_error(int err) : runtime_error(error_str(err)), errno_(err)
 
 std::string sys_error::error_str(int err)
 {
-	char buf[1024];
-	buf[0] = '\x0';
+    char buf[1024];
+    buf[0] = '\x0';
 
-	#if defined(_WIN32)
-		FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
-			NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-			buf, sizeof(buf), NULL);
+    #if defined(_WIN32)
+        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+            NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+            buf, sizeof(buf), NULL);
     #else
-    	#ifdef _GNU_SOURCE
-			#if !defined(__GLIBC__)
-			// use the XSI standard behavior.
-				int e = strerror_r(err, buf, sizeof(buf));
-				auto s = strerror(e);
-				return s ? std::string(s) : std::string();
-			#else
-			// assume GNU exception
-				auto s = strerror_r(err, buf, sizeof(buf));
-				return s ? std::string(s) : std::string();
-			#endif
+        #ifdef _GNU_SOURCE
+            #if defined(__GLIBC__) || (defined(__ANDROID_API__) && __ANDROID_API__ >= 23)
+                // assume GNU exception
+                auto s = strerror_r(err, buf, sizeof(buf));
+                return s ? std::string(s) : std::string();
+            #else
+                // use the XSI standard behavior.
+                int e = strerror_r(err, buf, sizeof(buf));
+                auto s = strerror(e);
+                return s ? std::string(s) : std::string();
+            #endif
         #else
             ignore_result(strerror_r(err, buf, sizeof(buf)));
         #endif
     #endif
-	return std::string(buf);
+    return std::string(buf);
 }
 
 /////////////////////////////////////////////////////////////////////////////