diff --git a/tools/shaderc/shaderc.cpp b/tools/shaderc/shaderc.cpp
index 39341262f..3575bb716 100644
--- a/tools/shaderc/shaderc.cpp
+++ b/tools/shaderc/shaderc.cpp
@@ -1106,6 +1106,7 @@ namespace bgfx
 				preprocessor.setDefine(hlslDefine);
 			}
 			else if (0 != glsl)
+			     || (0 != essl)
 			{
 				preprocessor.setDefine(glslDefine);
 			}
@@ -1127,6 +1128,7 @@ namespace bgfx
 				preprocessor.setDefine(hlslDefine);
 			}
 			else if (0 != glsl)
+			     || (0 != essl)
 			{
 				preprocessor.setDefine(glslDefine);
 			}