diff --git a/class-tgm-plugin-activation.php b/class-tgm-plugin-activation.php
index 1ea7b47e..a3528e29 100755
--- a/class-tgm-plugin-activation.php
+++ b/class-tgm-plugin-activation.php
@@ -1079,7 +1079,7 @@ public function notices() {
 					unset( $plugin_slug );
 
 					$count          = count( $plugin_group );
-					$linked_plugins = array_map( array( 'TGM_Utils', 'wrap_in_em' ), $linked_plugins );
+					$linked_plugins = array_map( array( 'TGMPA_Utils', 'wrap_in_em' ), $linked_plugins );
 					$last_plugin    = array_pop( $linked_plugins ); // Pop off last name to prep for readability.
 					$imploded       = empty( $linked_plugins ) ? $last_plugin : ( implode( ', ', $linked_plugins ) . ' ' . esc_html_x( 'and', 'plugin A *and* plugin B', 'tgmpa' ) . ' ' . $last_plugin );
 
@@ -1229,9 +1229,9 @@ public function register( $plugin ) {
 			// Forgive users for using string versions of booleans or floats for version number.
 			$plugin['version']            = (string) $plugin['version'];
 			$plugin['source']             = empty( $plugin['source'] ) ? 'repo' : $plugin['source'];
-			$plugin['required']           = TGM_Utils::validate_bool( $plugin['required'] );
-			$plugin['force_activation']   = TGM_Utils::validate_bool( $plugin['force_activation'] );
-			$plugin['force_deactivation'] = TGM_Utils::validate_bool( $plugin['force_deactivation'] );
+			$plugin['required']           = TGMPA_Utils::validate_bool( $plugin['required'] );
+			$plugin['force_activation']   = TGMPA_Utils::validate_bool( $plugin['force_activation'] );
+			$plugin['force_deactivation'] = TGMPA_Utils::validate_bool( $plugin['force_deactivation'] );
 
 			// Enrich the received data.
 			$plugin['file_path']   = $this->_get_plugin_basename_from_slug( $plugin['slug'] );
@@ -2776,7 +2776,7 @@ public function process_bulk_actions() {
 					echo '<div id="message" class="error"><p>', wp_kses_post( $activate->get_error_message() ), '</p></div>';
 				} else {
 					$count        = count( $plugin_names ); // Count so we can use _n function.
-					$plugin_names = array_map( array( 'TGM_Utils', 'wrap_in_strong' ), $plugin_names );
+					$plugin_names = array_map( array( 'TGMPA_Utils', 'wrap_in_strong' ), $plugin_names );
 					$last_plugin  = array_pop( $plugin_names ); // Pop off last name to prep for readability.
 					$imploded     = empty( $plugin_names ) ? $last_plugin : ( implode( ', ', $plugin_names ) . ' ' . esc_html_x( 'and', 'plugin A *and* plugin B', 'tgmpa' ) . ' ' . $last_plugin );
 
@@ -3413,19 +3413,21 @@ public function after_flush_output() {
 	}
 }
 
-if ( ! class_exists( 'TGM_Utils' ) ) {
+if ( ! class_exists( 'TGMPA_Utils' ) ) {
 
 	/**
 	 * Generic utilities for TGMPA.
 	 *
 	 * All methods are static, poor-dev name-spacing class wrapper.
 	 *
+	 * Class was called TGM_Utils in 2.5.0 but renamed TGMPA_Utils in 2.5.1 as this was conflicting with Soliloquy.
+	 *
 	 * @since 2.5.0
 	 *
 	 * @package TGM-Plugin-Activation
 	 * @author  Juliette Reinders Folmer
 	 */
-	class TGM_Utils {
+	class TGMPA_Utils {
 		/**
 		 * Whether the PHP filter extension is enabled.
 		 *
@@ -3536,5 +3538,5 @@ protected static function emulate_filter_bool( $value ) {
 
 			return false;
 		}
-	} // End of class TGM_Utils
+	} // End of class TGMPA_Utils
 } // End of class_exists wrapper