diff --git a/AltairZ80/m68k/m68kfpu.c b/AltairZ80/m68k/m68kfpu.c
index 0d0973e0..793e6e44 100644
--- a/AltairZ80/m68k/m68kfpu.c
+++ b/AltairZ80/m68k/m68kfpu.c
@@ -1,8 +1,7 @@
 #include <math.h>
 #include <stdio.h>
 #include <stdarg.h>
-
-extern void exit(int);
+#include <stdlib.h>
 
 static void fatalerror(const char *format, ...) {
       va_list ap;
@@ -128,7 +127,9 @@ static inline floatx80 load_pack_float80(uint32 ea)
     *ch++ = (char)(((dw1 >> 16) & 0xf) + '0');
     *ch = '\0';
 
-    sscanf(str, "%le", &tmp);
+    if (sscanf(str, "%le", &tmp) == 1) {
+        result = double_to_fx80(tmp);
+    }
 
     result = double_to_fx80(tmp);
 
@@ -596,7 +597,7 @@ static uint64 READ_EA_64(int ea)
 
 static floatx80 READ_EA_FPE(int mode, int reg, uint32 di_mode_ea)
 {
-    floatx80 fpr;
+    floatx80 fpr = { 0 };
 
     switch (mode)
     {
@@ -659,7 +660,7 @@ static floatx80 READ_EA_FPE(int mode, int reg, uint32 di_mode_ea)
 
 static floatx80 READ_EA_PACK(int ea)
 {
-    floatx80 fpr;
+    floatx80 fpr = { 0 };
     int mode = (ea >> 3) & 0x7;
     int reg = (ea & 0x7);
 
@@ -1052,7 +1053,7 @@ static void fpgen_rm_reg(uint16 w2)
     int src = (w2 >> 10) & 0x7;
     int dst = (w2 >>  7) & 0x7;
     int opmode = w2 & 0x7f;
-    floatx80 source;
+    floatx80 source = { 0 };
 
     // fmovecr #$f, fp0 f200 5c0f