diff --git a/read.c b/read.c
index 09524692b514e3e67baaf2c870be8a45d70fcfd3..34fce2e32261c571faad88a434c07e7dda2ac4e0 100644
--- a/read.c
+++ b/read.c
@@ -299,13 +299,17 @@ static int processLineItem(redisReader *r) {
                 memcpy(buf,p,len);
                 buf[len] = '\0';
 
-                if (strcasecmp(buf,",inf") == 0) {
+                if (strcasecmp(buf,"inf") == 0) {
                     d = INFINITY; /* Positive infinite. */
-                } else if (strcasecmp(buf,",-inf") == 0) {
+                } else if (strcasecmp(buf,"-inf") == 0) {
                     d = -INFINITY; /* Negative infinite. */
                 } else {
                     d = strtod((char*)buf,&eptr);
-                    if (buf[0] == '\0' || eptr[0] != '\0' || isnan(d)) {
+                    /* RESP3 only allows "inf", "-inf", and finite values, while
+                     * strtod() allows other variations on infinity, NaN,
+                     * etc. We explicity handle our two allowed infinite cases
+                     * above, so strtod() should only result in finite values. */
+                    if (buf[0] == '\0' || eptr[0] != '\0' || !isfinite(d)) {
                         __redisReaderSetError(r,REDIS_ERR_PROTOCOL,
                                 "Bad double value");
                         return REDIS_ERR;