diff --git a/storm/String.cpp b/storm/String.cpp
index 5631e44..4696719 100644
--- a/storm/String.cpp
+++ b/storm/String.cpp
@@ -607,7 +607,6 @@ float SStrToFloat(const char* string) {
         int32_t v24 = 0;
 
         if (v23 < 10) {
-            int32_t v25 = 0;
             int32_t v26 = -1;
             double v31;
 
@@ -615,7 +614,7 @@ float SStrToFloat(const char* string) {
                 string++;
 
                 if (v24 < 20) {
-                    v31 = s_realDigit[0][v25 + v23];
+                    v31 = s_realDigit[v24][v23];
                 } else {
                     v31 = pow(v16, v26) * v23;
                 }
@@ -625,7 +624,6 @@ float SStrToFloat(const char* string) {
                 v23 = *string - '0';
                 v24++;
                 v26--;
-                v25 += 10;
             } while (v23 < 10);
         }
     }
diff --git a/test/String.cpp b/test/String.cpp
index ee2bf16..dd0b343 100644
--- a/test/String.cpp
+++ b/test/String.cpp
@@ -353,6 +353,12 @@ TEST_CASE("SStrToFloat", "[string]") {
         auto result = SStrToFloat(string);
         REQUIRE(result == 1.0f);
     }
+
+    SECTION("converts string without causing UBsan exception") {
+        auto string = "0.82";
+        auto result = SStrToFloat(string);
+        REQUIRE(result == 0.82f);
+    }
 }
 
 TEST_CASE("SStrToInt", "[string]") {