diff --git a/src/rec/aiRecord.c b/src/rec/aiRecord.c
index a77a18239..609c13e2e 100644
--- a/src/rec/aiRecord.c
+++ b/src/rec/aiRecord.c
@@ -315,7 +315,7 @@ static long get_alarm_double(DBADDR *paddr,struct dbr_alDouble *pad)
 static void alarm(aiRecord *pai)
 {
 	double		val;
-	float		hyst, lalm, hihi, high, low, lolo;
+	double		hyst, lalm, hihi, high, low, lolo;
 	unsigned short	hhsv, llsv, hsv, lsv;
 
 	if(pai->udf == TRUE ){
diff --git a/src/rec/aoRecord.c b/src/rec/aoRecord.c
index 34e6dd551..2d0149765 100644
--- a/src/rec/aoRecord.c
+++ b/src/rec/aoRecord.c
@@ -389,7 +389,7 @@ static void alarm(pao)
     struct aoRecord	*pao;
 {
 	double		val;
-	float		hyst, lalm, hihi, high, low, lolo;
+	double		hyst, lalm, hihi, high, low, lolo;
 	unsigned short	hhsv, llsv, hsv, lsv;
 
 	if(pao->udf == TRUE ){
@@ -472,7 +472,7 @@ static void convert(pao,value)
 	/* now set value equal to desired output value */
         /* apply the output rate of change */
         if ( (pao->oroc) != 0.0 ){/*must be defined and >0*/
-		float		diff;
+		double		diff;
 
                 diff = value - pao->oval;
                 if (diff < 0){