diff --git a/src/coreclr/vm/interpexec.cpp b/src/coreclr/vm/interpexec.cpp
index 92bc3638ccb124..0dd6c9848569c1 100644
--- a/src/coreclr/vm/interpexec.cpp
+++ b/src/coreclr/vm/interpexec.cpp
@@ -1613,11 +1613,11 @@ void InterpExecMethod(InterpreterFrame *pInterpreterFrame, InterpMethodContextFr
                     ip += 3;
                     break;
                 case INTOP_CONV_U1_R4:
-                    ConvFpHelper<uint8_t, uint32_t, float>(stack, ip);
+                    ConvFpHelper<uint8_t, int32_t, float>(stack, ip);
                     ip += 3;
                     break;
                 case INTOP_CONV_U1_R8:
-                    ConvFpHelper<uint8_t, uint32_t, double>(stack, ip);
+                    ConvFpHelper<uint8_t, int32_t, double>(stack, ip);
                     ip += 3;
                     break;
                 case INTOP_CONV_I2_I4:
@@ -1645,11 +1645,11 @@ void InterpExecMethod(InterpreterFrame *pInterpreterFrame, InterpMethodContextFr
                     ip += 3;
                     break;
                 case INTOP_CONV_U2_R4:
-                    ConvFpHelper<uint16_t, uint32_t, float>(stack, ip);
+                    ConvFpHelper<uint16_t, int32_t, float>(stack, ip);
                     ip += 3;
                     break;
                 case INTOP_CONV_U2_R8:
-                    ConvFpHelper<uint16_t, uint32_t, double>(stack, ip);
+                    ConvFpHelper<uint16_t, int32_t, double>(stack, ip);
                     ip += 3;
                     break;
                 case INTOP_CONV_I4_R4: