diff --git a/utils/fprcp/fpmake.pp b/utils/fprcp/fpmake.pp
index be79b646eb..d76b657dab 100644
--- a/utils/fprcp/fpmake.pp
+++ b/utils/fprcp/fpmake.pp
@@ -23,6 +23,8 @@ begin
       P.OSes := P.OSes - [java,android];
     { palmos does not have classes }
     P.OSes := P.OSes - [palmos];
+    { Program does not fit in 16-bit memory constraints }
+    P.OSes := P.OSes - [msdos,win16];
 
     P.Author := '<various>';
     P.License := 'LGPL with modification';
diff --git a/utils/h2pas/fpmake.pp b/utils/h2pas/fpmake.pp
index db917cd5ea..e79a9450a3 100644
--- a/utils/h2pas/fpmake.pp
+++ b/utils/h2pas/fpmake.pp
@@ -22,6 +22,8 @@ begin
       P.OSes := P.OSes - [java,android];
     { palmos does not support command line parameters }
     P.OSes := P.OSes - [palmos];
+    { Program does not fit in 16-bit memory constraints }
+    P.OSes := P.OSes - [msdos,win16];
 
     P.Author := '<various>';
     P.License := 'LGPL with modification';
diff --git a/utils/tply/fpmake.pp b/utils/tply/fpmake.pp
index 97f8f41cd8..11cf02227d 100644
--- a/utils/tply/fpmake.pp
+++ b/utils/tply/fpmake.pp
@@ -23,6 +23,8 @@ begin
       P.OSes := P.OSes - [java,android];
     { palmos does not support command line parameters }
     P.OSes := P.OSes - [palmos];
+    { Program does not fit in 16-bit memory constraints }
+    P.OSes := P.OSes - [msdos,win16];
 
     P.Author := '<various>';
     P.License := 'LGPL with modification';