diff --git a/src/cressi_edy.c b/src/cressi_edy.c
index 67ca985..732635c 100644
--- a/src/cressi_edy.c
+++ b/src/cressi_edy.c
@@ -275,8 +275,9 @@ cressi_edy_device_read (device_t *abstract, unsigned int address, unsigned char
 	if (! device_is_cressi_edy (abstract))
 		return DEVICE_STATUS_TYPE_MISMATCH;
 
-	assert (address % (CRESSI_EDY_PACKET_SIZE / 4)== 0);
-	assert (size    % CRESSI_EDY_PACKET_SIZE == 0);
+	if ((address % (CRESSI_EDY_PACKET_SIZE / 4) != 0) ||
+		(size    % CRESSI_EDY_PACKET_SIZE != 0))
+		return DEVICE_STATUS_ERROR;
 
 	// The data transmission is split in packages
 	// of maximum $CRESSI_EDY_PACKET_SIZE bytes.
diff --git a/src/oceanic_atom2.c b/src/oceanic_atom2.c
index fc7fe70..8465eef 100644
--- a/src/oceanic_atom2.c
+++ b/src/oceanic_atom2.c
@@ -21,7 +21,6 @@
 
 #include <string.h> // memcpy
 #include <stdlib.h> // malloc, free
-#include <assert.h> // assert
 
 #include "device-private.h"
 #include "oceanic_common.h"
@@ -459,8 +458,9 @@ oceanic_atom2_device_read (device_t *abstract, unsigned int address, unsigned ch
 	if (! device_is_oceanic_atom2 (abstract))
 		return DEVICE_STATUS_TYPE_MISMATCH;
 
-	assert (address % PAGESIZE == 0);
-	assert (size    % PAGESIZE == 0);
+	if ((address % PAGESIZE != 0) ||
+		(size    % PAGESIZE != 0))
+		return DEVICE_STATUS_ERROR;
 	
 	// The data transmission is split in packages
 	// of maximum $PAGESIZE bytes.
@@ -497,8 +497,9 @@ oceanic_atom2_device_write (device_t *abstract, unsigned int address, const unsi
 	if (! device_is_oceanic_atom2 (abstract))
 		return DEVICE_STATUS_TYPE_MISMATCH;
 
-	assert (address % PAGESIZE == 0);
-	assert (size    % PAGESIZE == 0);
+	if ((address % PAGESIZE != 0) ||
+		(size    % PAGESIZE != 0))
+		return DEVICE_STATUS_ERROR;
 
 	// The data transmission is split in packages
 	// of maximum $PAGESIZE bytes.
diff --git a/src/oceanic_veo250.c b/src/oceanic_veo250.c
index 663c782..982c6b1 100644
--- a/src/oceanic_veo250.c
+++ b/src/oceanic_veo250.c
@@ -21,7 +21,6 @@
 
 #include <string.h> // memcpy
 #include <stdlib.h> // malloc, free
-#include <assert.h> // assert
 
 #include "device-private.h"
 #include "oceanic_common.h"
@@ -394,8 +393,9 @@ oceanic_veo250_device_read (device_t *abstract, unsigned int address, unsigned c
 	if (! device_is_oceanic_veo250 (abstract))
 		return DEVICE_STATUS_TYPE_MISMATCH;
 
-	assert (address % PAGESIZE == 0);
-	assert (size    % PAGESIZE == 0);
+	if ((address % PAGESIZE != 0) ||
+		(size    % PAGESIZE != 0))
+		return DEVICE_STATUS_ERROR;
 
 	// The data transmission is split in packages
 	// of maximum $PAGESIZE bytes.
diff --git a/src/oceanic_vtpro.c b/src/oceanic_vtpro.c
index ac9545e..4cc0aca 100644
--- a/src/oceanic_vtpro.c
+++ b/src/oceanic_vtpro.c
@@ -21,7 +21,6 @@
 
 #include <string.h> // memcpy
 #include <stdlib.h> // malloc, free
-#include <assert.h> // assert
 
 #include "device-private.h"
 #include "oceanic_common.h"
@@ -462,8 +461,9 @@ oceanic_vtpro_device_read (device_t *abstract, unsigned int address, unsigned ch
 	if (! device_is_oceanic_vtpro (abstract))
 		return DEVICE_STATUS_TYPE_MISMATCH;
 
-	assert (address % PAGESIZE == 0);
-	assert (size    % PAGESIZE == 0);
+	if ((address % PAGESIZE != 0) ||
+		(size    % PAGESIZE != 0))
+		return DEVICE_STATUS_ERROR;
 
 	// The data transmission is split in packages
 	// of maximum $PAGESIZE bytes.