diff --git a/binary.cc b/binary.cc
index 367e4e75..4953cf7e 100644
--- a/binary.cc
+++ b/binary.cc
@@ -489,6 +489,7 @@ bool binary_parser_t::test(std::istream& in) const
       read_binary_number<unsigned long>(in) == format_version)
     return true;
 
+  in.clear();
   in.seekg(0, std::ios::beg);
   return false;
 }
diff --git a/gnucash.cc b/gnucash.cc
index 49e12117..02e5b477 100644
--- a/gnucash.cc
+++ b/gnucash.cc
@@ -345,6 +345,7 @@ bool gnucash_parser_t::test(std::istream& in) const
 {
   char buf[5];
   in.read(buf, 5);
+  in.clear();
   in.seekg(0, std::ios::beg);
 
   return std::strncmp(buf, "<?xml", 5) == 0;
diff --git a/ofx.cc b/ofx.cc
index 731105a5..5eed5c64 100644
--- a/ofx.cc
+++ b/ofx.cc
@@ -172,10 +172,12 @@ bool ofx_parser_t::test(std::istream& in) const
 
   in.getline(buf, 79);
   if (std::strncmp(buf, "OFXHEADER", 9) == 0) {
+    in.clear();
     in.seekg(0, std::ios::beg);
     return true;
   }
   else if (std::strncmp(buf, "<?xml", 5) != 0) {
+    in.clear();
     in.seekg(0, std::ios::beg);
     return false;
   }
@@ -183,10 +185,12 @@ bool ofx_parser_t::test(std::istream& in) const
   in.getline(buf, 79);
   if (std::strncmp(buf, "<?OFX", 5) != 0 &&
       std::strncmp(buf, "<?ofx", 5) != 0) {
+    in.clear();
     in.seekg(0, std::ios::beg);
     return false;
   }
 
+  in.clear();
   in.seekg(0, std::ios::beg);
   return true;
 }
diff --git a/qif.cc b/qif.cc
index 52ed6d48..429bdcc9 100644
--- a/qif.cc
+++ b/qif.cc
@@ -30,6 +30,7 @@ bool qif_parser_t::test(std::istream& in) const
   char magic[sizeof(unsigned int) + 1];
   in.read(magic, sizeof(unsigned int));
   magic[sizeof(unsigned int)] = '\0';
+  in.clear();
   in.seekg(0, std::ios::beg);
 
   return (std::strcmp(magic, "!Typ") == 0 ||
diff --git a/textual.cc b/textual.cc
index 37373baa..9fb383ca 100644
--- a/textual.cc
+++ b/textual.cc
@@ -457,6 +457,7 @@ bool textual_parser_t::test(std::istream& in) const
 #endif
   }
 
+  in.clear();
   in.seekg(0, std::ios::beg);
   assert(in.good());
   return true;
diff --git a/xml.cc b/xml.cc
index 4bebbf44..380416ed 100644
--- a/xml.cc
+++ b/xml.cc
@@ -158,16 +158,19 @@ bool xml_parser_t::test(std::istream& in) const
 
   in.getline(buf, 79);
   if (std::strncmp(buf, "<?xml", 5) != 0) {
+    in.clear();
     in.seekg(0, std::ios::beg);
     return false;
   }
 
   in.getline(buf, 79);
   if (! std::strstr(buf, "<ledger")) {
+    in.clear();
     in.seekg(0, std::ios::beg);
     return false;
   }
 
+  in.clear();
   in.seekg(0, std::ios::beg);
   return true;
 }