diff --git a/libclamav/readdb.c b/libclamav/readdb.c
index 45e00cfe19..b984e069b8 100644
--- a/libclamav/readdb.c
+++ b/libclamav/readdb.c
@@ -1228,7 +1228,7 @@ static int cli_chkpua(const char *signame, const char *pua_cats, unsigned int op
     // Add null terminator.
     cat[catlen + 1] = '\0';
 
-    cat_pt = strstr(cat, pua_cats);
+    cat_pt = strstr(pua_cats, cat);
     cli_dbgmsg("cli_chkpua:                cat=[%s]\n", cat);
     cli_dbgmsg("cli_chkpua:                sig=[%s]\n", sig);
     if (options & CL_DB_PUA_INCLUDE)