diff --git a/src/chipset/ali1543.c b/src/chipset/ali1543.c
index 67b513a94..158d42ba4 100644
--- a/src/chipset/ali1543.c
+++ b/src/chipset/ali1543.c
@@ -138,7 +138,7 @@ ali1533_write(int func, int addr, uint8_t val, void *priv)
         switch(val & 7)
         {
             case 0:
-            cpu_set_isa_speed(7.16);
+            cpu_set_isa_speed(7159091);
             break;
             case 1:
             case 2:
diff --git a/src/chipset/sis_5511.c b/src/chipset/sis_5511.c
index e9a566d44..673d37ebe 100644
--- a/src/chipset/sis_5511.c
+++ b/src/chipset/sis_5511.c
@@ -572,7 +572,7 @@ sis_5513_isa_write(uint16_t addr, uint8_t val, void *priv)
 			switch (val >> 6)
 			{
 			case 0:
-				cpu_set_isa_speed(7.159);
+				cpu_set_isa_speed(7159091);
 				break;
 			case 1:
 				cpu_set_isa_pci_div(4);
diff --git a/src/chipset/sis_5571.c b/src/chipset/sis_5571.c
index 93f3911a8..674db6bb5 100644
--- a/src/chipset/sis_5571.c
+++ b/src/chipset/sis_5571.c
@@ -373,7 +373,7 @@ pci_isa_bridge_write(int func, int addr, uint8_t val, void *priv)
 			switch ((val & 0xc0) >> 6)
 			{
 			case 0:
-				cpu_set_isa_speed(7.159);
+				cpu_set_isa_speed(7159091);
 				break;
 			case 1:
 				cpu_set_isa_pci_div(4);
diff --git a/src/chipset/sis_5598.c b/src/chipset/sis_5598.c
index fd9455bb6..e37074d6f 100644
--- a/src/chipset/sis_5598.c
+++ b/src/chipset/sis_5598.c
@@ -497,7 +497,7 @@ void sis_5598_pcitoisa_write(int addr, uint8_t val, sis_5598_t *dev)
         switch ((val & 0xc0) >> 6)
         {
         case 0:
-            cpu_set_isa_speed(7.159);
+            cpu_set_isa_speed(7159091);
             break;
         case 1:
             cpu_set_isa_pci_div(4);