diff --git a/lib/googlecloudsdk/api_lib/sql/instances.py b/lib/googlecloudsdk/api_lib/sql/instances.py
index 0d88ffe..814a436 100644
--- a/lib/googlecloudsdk/api_lib/sql/instances.py
+++ b/lib/googlecloudsdk/api_lib/sql/instances.py
@@ -85,18 +85,19 @@ def GetRegionFromZone(gce_zone):
 def _GetCloudSqlProxyPath():
   """Determines the path to the cloud_sql_proxy binary."""
   sdk_bin_path = config.Paths().sdk_bin_path
-  if not sdk_bin_path:
-    # Check if cloud_sql_proxy is located on the PATH.
-    proxy_path = file_utils.FindExecutableOnPath('cloud_sql_proxy')
-    if proxy_path:
-      log.debug(
-          'Using cloud_sql_proxy found at [{path}]'.format(path=proxy_path))
-      return proxy_path
-    else:
-      raise sql_exceptions.SqlProxyNotFound(
-          'A Cloud SQL Proxy SDK root could not be found. Please check your '
-          'installation.')
-  return os.path.join(sdk_bin_path, 'cloud_sql_proxy')
+  if sdk_bin_path and os.path.isfile(os.path.join(sdk_bin_path, 'cloud_sql_proxy')):
+      return os.path.join(sdk_bin_path, 'cloud_sql_proxy')
+
+  # Check if cloud_sql_proxy is located on the PATH.
+  proxy_path = file_utils.FindExecutableOnPath('cloud_sql_proxy')
+  if proxy_path:
+    log.debug(
+        'Using cloud_sql_proxy found at [{path}]'.format(path=proxy_path))
+    return proxy_path
+
+  raise sql_exceptions.SqlProxyNotFound(
+      'A Cloud SQL Proxy SDK root could not be found. Please check your '
+      'installation.')
 
 
 def _RaiseProxyError(error_msg=None):