diff --git a/Frameworks/playptmod/playptmod/playptmod.c b/Frameworks/playptmod/playptmod/playptmod.c
index 8eca66850..e17c5248a 100644
--- a/Frameworks/playptmod/playptmod/playptmod.c
+++ b/Frameworks/playptmod/playptmod/playptmod.c
@@ -1333,12 +1333,13 @@ int playptmod_LoadMem(void *_p, const unsigned char *buf, unsigned long bufLengt
         s->offset = sampleOffset;
         
         j = (s->length + 1) / 2 + 5 + 16;
+        if ( j > s->length ) j = s->length;
         
         bufread(tempSample, 1, j, fmodule);
 
         smpDat8 = tempSample;
         
-        if (s->length > 5 && memcmp(smpDat8, "ADPCM", 5) == 0)
+        if (j > 5 + 16 && memcmp(smpDat8, "ADPCM", 5) == 0)
         {
             s->reallength = j;
         }