diff --git a/src/server/common.cc b/src/server/common.cc
index 06911663ab79..42e28f7cab0e 100644
--- a/src/server/common.cc
+++ b/src/server/common.cc
@@ -5,6 +5,7 @@
 #include "server/common.h"
 
 #include <absl/strings/charconv.h>
+#include <absl/strings/match.h>
 #include <absl/strings/str_cat.h>
 #include <mimalloc.h>
 
@@ -168,9 +169,9 @@ bool ParseDouble(string_view src, double* value) {
   if (src.empty())
     return false;
 
-  if (src == "-inf") {
+  if (absl::EqualsIgnoreCase(src, "-inf")) {
     *value = -HUGE_VAL;
-  } else if (src == "+inf") {
+  } else if (absl::EqualsIgnoreCase(src, "+inf")) {
     *value = HUGE_VAL;
   } else {
     absl::from_chars_result result = absl::from_chars(src.data(), src.end(), *value);
diff --git a/src/server/zset_family_test.cc b/src/server/zset_family_test.cc
index e416afe14a41..4d31d0ce5d56 100644
--- a/src/server/zset_family_test.cc
+++ b/src/server/zset_family_test.cc
@@ -150,6 +150,16 @@ TEST_F(ZSetFamilyTest, ZRevRange) {
   resp = Run({"zrevrange", "key", "1", "2", "withscores"});
   ASSERT_THAT(resp, ArrLen(4));
   EXPECT_THAT(resp.GetVec(), ElementsAre("b", "1", "a", "-inf"));
+
+  // Make sure that when using with upper case it works as well (see
+  // https://github.com/dragonflydb/dragonfly/issues/326)
+  resp = Run({"zrevrangebyscore", "key", "2", "-INF"});
+  ASSERT_THAT(resp, ArrLen(3));
+  EXPECT_THAT(resp.GetVec(), ElementsAre("c", "b", "a"));
+
+  resp = Run({"zrevrangebyscore", "key", "2", "-INF", "withscores"});
+  ASSERT_THAT(resp, ArrLen(6));
+  EXPECT_THAT(resp.GetVec(), ElementsAre("c", "2", "b", "1", "a", "-inf"));
 }
 
 TEST_F(ZSetFamilyTest, ZScan) {