diff --git a/polymer/eduke32/build/src/defs.c b/polymer/eduke32/build/src/defs.c
index 7c26c3380..7ff2f6bba 100644
--- a/polymer/eduke32/build/src/defs.c
+++ b/polymer/eduke32/build/src/defs.c
@@ -3504,11 +3504,12 @@ static int32_t defsparser(scriptfile *script)
 
             switch (value)
             {
-                case 0: /*case 1:*/ case 2: case 4: case 8: case 16: case 32: case 64: case 128:
+                case 1: case 3: case 7: case 15: case 31: case 63: case 127:
+                case 2: case 4: case 8: case 16: case 32: case 64: case 128:
 #ifdef USE_OPENGL
-                    for (int32_t a = 1, value2 = value*2; a <= value; ++a)
+                    for (int32_t a = 1, value2 = value*2 + (value&1); a <= value; ++a)
                     {
-                        float finv2value = 0.5f/(float)value;
+                        float finv2value = 1.f/(float)value2;
 
                         glblend_t * const glb = glblend + a;
                         *glb = defaultglblend;
@@ -3516,6 +3517,7 @@ static int32_t defsparser(scriptfile *script)
                         glb->def[1].alpha = (float)a * finv2value;
                     }
 #endif
+                case 0:
                     numalphatabs = value;
                     break;
                 default:
diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 06d2a69f7..454592fe5 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -4725,7 +4725,7 @@ static size_t falpha_to_blend(float alpha, int32_t *cstatptr, uint8_t *blendptr,
 {
     int32_t cstat = *cstatptr | transbit1;
 
-    int32_t const twonumalphatabs = 2*numalphatabs;
+    int32_t const twonumalphatabs = 2*numalphatabs + (numalphatabs&1);
     int32_t blendidx = Blrintf(alpha * twonumalphatabs);
     if (blendidx > numalphatabs)
     {