diff --git a/xfa/fgas/crt/cfgas_stringformatter.cpp b/xfa/fgas/crt/cfgas_stringformatter.cpp
index 02ace49..9169820 100644
--- a/xfa/fgas/crt/cfgas_stringformatter.cpp
+++ b/xfa/fgas/crt/cfgas_stringformatter.cpp
@@ -1216,6 +1216,7 @@
         ccf--;
         break;
       case 'E': {
+        iExponent = 0;
         bool bExpSign = false;
         while (cc < spSrcNum.size()) {
           if (spSrcNum[cc] == 'E' || spSrcNum[cc] == 'e')
@@ -1407,6 +1408,7 @@
               (spSrcNum[cc] != 'E' && spSrcNum[cc] != 'e')) {
             return false;
           }
+          iExponent = 0;
           bool bExpSign = false;
           cc++;
           if (cc < spSrcNum.size()) {
diff --git a/xfa/fgas/crt/cfgas_stringformatter_unittest.cpp b/xfa/fgas/crt/cfgas_stringformatter_unittest.cpp
index 1803acf..45a2b60 100644
--- a/xfa/fgas/crt/cfgas_stringformatter_unittest.cpp
+++ b/xfa/fgas/crt/cfgas_stringformatter_unittest.cpp
@@ -465,6 +465,9 @@
 
       // https://crbug.com/945836
       {L"en", L"9.E99999999999", L"EdEE.E999", L""},
+
+      // https://crbug.com/947188
+      {L"en", L"-3.E98998998 ", L" 35EEEE.EE98", L""},
   };
 
   for (const auto& test : tests) {