diff --git a/src/H5Tconv_macros.h b/src/H5Tconv_macros.h
index 720f366dd4c..6038afce3a8 100644
--- a/src/H5Tconv_macros.h
+++ b/src/H5Tconv_macros.h
@@ -881,15 +881,15 @@ typedef struct H5T_conv_hw_t {
 #ifdef _MSC_VER
 #define H5T_CONV_CAST_TO_FLOAT_COMPLEX(S_REAL, S_IMAG, D, DT)                                                \
     {                                                                                                        \
-        *(D) = (DT)H5_CMPLXF(S_REAL, S_IMAG);                                                                \
+        *(D) = H5_CMPLXF(S_REAL, S_IMAG);                                                                    \
     }
 #define H5T_CONV_CAST_TO_DOUBLE_COMPLEX(S_REAL, S_IMAG, D, DT)                                               \
     {                                                                                                        \
-        *(D) = (DT)H5_CMPLX(S_REAL, S_IMAG);                                                                 \
+        *(D) = H5_CMPLX(S_REAL, S_IMAG);                                                                     \
     }
 #define H5T_CONV_CAST_TO_LDOUBLE_COMPLEX(S_REAL, S_IMAG, D, DT)                                              \
     {                                                                                                        \
-        *(D) = (DT)H5_CMPLXL(S_REAL, S_IMAG);                                                                \
+        *(D) = H5_CMPLXL(S_REAL, S_IMAG);                                                                    \
     }
 
 #define H5T_CONV_CAST_zZ(STYPE, DTYPE, S, S_REAL, S_IMAG, D, ST, DT)                                         \