diff --git a/lexers/embedded/nasm.xml b/lexers/embedded/nasm.xml
index a6107b5d6..72f92b20d 100644
--- a/lexers/embedded/nasm.xml
+++ b/lexers/embedded/nasm.xml
@@ -6,6 +6,7 @@
     <filename>*.ASM</filename>
     <mime_type>text/x-nasm</mime_type>
     <case_insensitive>true</case_insensitive>
+    <priority>1.0</priority> <!-- TASM uses the same file endings, but TASM is not as common as NASM, so we prioritize NASM higher by default. -->
   </config>
   <rules>
     <state name="punctuation">