diff --git a/fhem/FHEM/00_NetzerI2C.pm b/fhem/FHEM/00_NetzerI2C.pm
index 9ad8c6559..c4ae89caa 100644
--- a/fhem/FHEM/00_NetzerI2C.pm
+++ b/fhem/FHEM/00_NetzerI2C.pm
@@ -27,7 +27,7 @@ I2C_MCP.*
 I2C_BME280
 I2C_BMP180
 I2C_BH1750
-I2C_SHT21
+I2C_SHT.*
 I2C_TSL2561
 I2C_K30
 );
diff --git a/fhem/FHEM/00_RPII2C.pm b/fhem/FHEM/00_RPII2C.pm
index 2320bca15..76abe054e 100644
--- a/fhem/FHEM/00_RPII2C.pm
+++ b/fhem/FHEM/00_RPII2C.pm
@@ -17,7 +17,7 @@ I2C_MCP.*
 I2C_BME280
 I2C_BMP180
 I2C_BH1750
-I2C_SHT21
+I2C_SHT.*
 I2C_TSL2561
 I2C_K30
 );
diff --git a/fhem/FHEM/10_FRM.pm b/fhem/FHEM/10_FRM.pm
index cbb6a8640..83309d2d0 100755
--- a/fhem/FHEM/10_FRM.pm
+++ b/fhem/FHEM/10_FRM.pm
@@ -50,7 +50,7 @@ my @clients = qw(
   I2C_DS1307
   I2C_PC.*
   I2C_MCP23.*
-  I2C_SHT21
+  I2C_SHT.*
   I2C_BME280
   I2C_BMP180
   I2C_BH1750
diff --git a/fhem/FHEM/52_I2C_SHT21.pm b/fhem/FHEM/52_I2C_SHT21.pm
index 2b2ca590c..395d5bb0e 100644
--- a/fhem/FHEM/52_I2C_SHT21.pm
+++ b/fhem/FHEM/52_I2C_SHT21.pm
@@ -293,7 +293,7 @@ sub I2C_SHT21_CheckCrc(@) {
 			$crc = ($crc & 0x80 ? $poly : 0 ) ^ ($crc << 1);
 		}
 	}
-	return ($crc = $data[2] ? undef : $crc);
+	return ($crc == $data[2] ? undef : $crc);
 }
 
 sub I2C_SHT21_DbLog_splitFn($) {