diff --git a/source/sw/src/interp.cpp b/source/sw/src/interp.cpp
index 923db284b..c8b5615fe 100644
--- a/source/sw/src/interp.cpp
+++ b/source/sw/src/interp.cpp
@@ -34,7 +34,7 @@ Prepared for public release: 03/28/2005 - Charlie Wiederhold, 3D Realms
 BEGIN_SW_NS
 
 #define MAXINTERPOLATIONS 1024
-int numinterpolations = 0, startofdynamicinterpolations = 0;
+int numinterpolations = 0;
 int oldipos[MAXINTERPOLATIONS];
 int bakipos[MAXINTERPOLATIONS];
 int *curipos[MAXINTERPOLATIONS];
@@ -61,7 +61,7 @@ void stopinterpolation(int *posptr)
 {
     int i;
 
-    for (i = numinterpolations - 1; i >= startofdynamicinterpolations; i--)
+    for (i = numinterpolations - 1; i >= 0; i--)
     {
         if (curipos[i] == posptr)
         {
diff --git a/source/sw/src/interp.h b/source/sw/src/interp.h
index 9b8704a9f..678db9630 100644
--- a/source/sw/src/interp.h
+++ b/source/sw/src/interp.h
@@ -26,13 +26,13 @@ Prepared for public release: 03/28/2005 - Charlie Wiederhold, 3D Realms
 BEGIN_SW_NS
 
 #define SHORT_MAXINTERPOLATIONS 256
-extern short short_numinterpolations, short_startofdynamicinterpolations;
+extern short short_numinterpolations;
 extern short short_oldipos[SHORT_MAXINTERPOLATIONS];
 extern short short_bakipos[SHORT_MAXINTERPOLATIONS];
 extern short *short_curipos[SHORT_MAXINTERPOLATIONS];
 
 #define MAXINTERPOLATIONS 1024
-extern int numinterpolations, startofdynamicinterpolations;
+extern int numinterpolations;
 extern int oldipos[MAXINTERPOLATIONS];
 extern int bakipos[MAXINTERPOLATIONS];
 extern int *curipos[MAXINTERPOLATIONS];
diff --git a/source/sw/src/interpsh.cpp b/source/sw/src/interpsh.cpp
index fa513ba1a..a556c2ddf 100644
--- a/source/sw/src/interpsh.cpp
+++ b/source/sw/src/interpsh.cpp
@@ -34,7 +34,7 @@ Prepared for public release: 03/28/2005 - Charlie Wiederhold, 3D Realms
 BEGIN_SW_NS
 
 #define SHORT_MAXINTERPOLATIONS 256
-short short_numinterpolations = 0, short_startofdynamicinterpolations = 0;
+short short_numinterpolations = 0;
 short short_oldipos[SHORT_MAXINTERPOLATIONS];
 short short_bakipos[SHORT_MAXINTERPOLATIONS];
 short *short_curipos[SHORT_MAXINTERPOLATIONS];
@@ -61,7 +61,7 @@ void short_stopinterpolation(short *posptr)
 {
     int i;
 
-    for (i = short_numinterpolations - 1; i >= short_startofdynamicinterpolations; i--)
+    for (i = short_numinterpolations - 1; i >= 0; i--)
     {
         if (short_curipos[i] == posptr)
         {
diff --git a/source/sw/src/save.cpp b/source/sw/src/save.cpp
index b82b5d9b3..90474c366 100644
--- a/source/sw/src/save.cpp
+++ b/source/sw/src/save.cpp
@@ -594,7 +594,6 @@ bool GameInterface::SaveGame(FSaveGameNode *sv)
 
     // long interpolations
     MWRITE(&numinterpolations,sizeof(numinterpolations),1,fil);
-    MWRITE(&startofdynamicinterpolations,sizeof(startofdynamicinterpolations),1,fil);
     MWRITE(oldipos,sizeof(oldipos),1,fil);
     MWRITE(bakipos,sizeof(bakipos),1,fil);
     for (i = numinterpolations - 1; i >= 0; i--)
@@ -605,7 +604,6 @@ bool GameInterface::SaveGame(FSaveGameNode *sv)
 
     // short interpolations
     MWRITE(&short_numinterpolations,sizeof(short_numinterpolations),1,fil);
-    MWRITE(&short_startofdynamicinterpolations,sizeof(short_startofdynamicinterpolations),1,fil);
     MWRITE(short_oldipos,sizeof(short_oldipos),1,fil);
     MWRITE(short_bakipos,sizeof(short_bakipos),1,fil);
     for (i = short_numinterpolations - 1; i >= 0; i--)
@@ -983,7 +981,6 @@ bool GameInterface::LoadGame(FSaveGameNode* sv)
 
     // long interpolations
     MREAD(&numinterpolations,sizeof(numinterpolations),1,fil);
-    MREAD(&startofdynamicinterpolations,sizeof(startofdynamicinterpolations),1,fil);
     MREAD(oldipos,sizeof(oldipos),1,fil);
     MREAD(bakipos,sizeof(bakipos),1,fil);
     for (i = numinterpolations - 1; i >= 0; i--)
@@ -992,7 +989,6 @@ bool GameInterface::LoadGame(FSaveGameNode* sv)
 
     // short interpolations
     MREAD(&short_numinterpolations,sizeof(short_numinterpolations),1,fil);
-    MREAD(&short_startofdynamicinterpolations,sizeof(short_startofdynamicinterpolations),1,fil);
     MREAD(short_oldipos,sizeof(short_oldipos),1,fil);
     MREAD(short_bakipos,sizeof(short_bakipos),1,fil);
     for (i = short_numinterpolations - 1; i >= 0; i--)