diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index 6b968b5c2..1bf73bcce 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -560,9 +560,12 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
       for (int i=0; i<ds.waveLen; i++) {
         DivWavetable* wave=new DivWavetable;
         wave->len=(unsigned char)reader.readI();
-        if (ds.system[0]==DIV_SYSTEM_GB || ds.system[0]==DIV_SYSTEM_NES_FDS) {
+        if (ds.system[0]==DIV_SYSTEM_GB) {
           wave->max=15;
         }
+        if (ds.system[0]==DIV_SYSTEM_NES_FDS) {
+          wave->max=63;
+        }
         if (wave->len>65) {
           logE("invalid wave length %d. are we doing something wrong?\n",wave->len);
           lastError="file is corrupt or unreadable at wavetables";