diff --git a/kernel/arch/i386/exception.c b/kernel/arch/i386/exception.c
index 86eb54101..7b3e1e378 100644
--- a/kernel/arch/i386/exception.c
+++ b/kernel/arch/i386/exception.c
@@ -285,7 +285,9 @@ PUBLIC void proc_stacktrace(struct proc *whichproc)
 
 PUBLIC void enable_fpu_exception(void)
 {
-	write_cr0(read_cr0() | I386_CR0_TS);
+	u32_t cr0 = read_cr0();
+	if(!(cr0 & I386_CR0_TS))
+		write_cr0(cr0 | I386_CR0_TS);
 }
 
 PUBLIC void disable_fpu_exception(void)