diff --git a/c_c++/windows/x64/riffa.c b/c_c++/windows/x64/riffa.c
index e7ee501..67496a3 100755
--- a/c_c++/windows/x64/riffa.c
+++ b/c_c++/windows/x64/riffa.c
@@ -150,6 +150,7 @@ int RIFFACALL fpga_send(fpga_t * fpga, int chnl, void * data, int len,
 			printf("Error in DeviceIoControl: %d\n", GetLastError());
 		}
 	}
+	CloseHandle(evt);
 	return wordsReturned;
 }
 
@@ -198,6 +199,7 @@ int RIFFACALL fpga_recv(fpga_t * fpga, int chnl, void * data, int len,
 			printf("Error in DeviceIoControl: %d\n", GetLastError());
 		}
 	}
+	CloseHandle(evt);
 	return wordsReturned;
 }
 
diff --git a/c_c++/windows/x86/riffa.c b/c_c++/windows/x86/riffa.c
index e7ee501..67496a3 100755
--- a/c_c++/windows/x86/riffa.c
+++ b/c_c++/windows/x86/riffa.c
@@ -150,6 +150,7 @@ int RIFFACALL fpga_send(fpga_t * fpga, int chnl, void * data, int len,
 			printf("Error in DeviceIoControl: %d\n", GetLastError());
 		}
 	}
+	CloseHandle(evt);
 	return wordsReturned;
 }
 
@@ -198,6 +199,7 @@ int RIFFACALL fpga_recv(fpga_t * fpga, int chnl, void * data, int len,
 			printf("Error in DeviceIoControl: %d\n", GetLastError());
 		}
 	}
+	CloseHandle(evt);
 	return wordsReturned;
 }