diff --git a/src/drivers/bus/eisa.c b/src/drivers/bus/eisa.c
index eed99ffe..d9d02d72 100644
--- a/src/drivers/bus/eisa.c
+++ b/src/drivers/bus/eisa.c
@@ -106,11 +106,12 @@ static int eisabus_probe ( struct root_device *rootdev ) {
 	for ( slot = EISA_MIN_SLOT ; slot <= EISA_MAX_SLOT ; slot++ ) {
 		/* Allocate struct eisa_device */
 		if ( ! eisa )
-			eisa = zalloc ( sizeof ( *eisa ) );
+			eisa = malloc ( sizeof ( *eisa ) );
 		if ( ! eisa ) {
 			rc = -ENOMEM;
 			goto err;
 		}
+		memset ( eisa, 0, sizeof ( *eisa ) );
 		eisa->slot = slot;
 		eisa->ioaddr = EISA_SLOT_BASE ( eisa->slot );
 
diff --git a/src/drivers/bus/isa.c b/src/drivers/bus/isa.c
index edcf05bb..a4105fd0 100644
--- a/src/drivers/bus/isa.c
+++ b/src/drivers/bus/isa.c
@@ -105,11 +105,12 @@ static int isabus_probe ( struct root_device *rootdev ) {
 		      ioidx <= ISA_IOIDX_MAX ( driver ) ; ioidx++ ) {
 			/* Allocate struct isa_device */
 			if ( ! isa )
-				isa = zalloc ( sizeof ( *isa ) );
+				isa = malloc ( sizeof ( *isa ) );
 			if ( ! isa ) {
 				rc = -ENOMEM;
 				goto err;
 			}
+			memset ( isa, 0, sizeof ( *isa ) );
 			isa->driver = driver;
 			isa->ioaddr = ISA_IOADDR ( driver, ioidx );
 
diff --git a/src/drivers/bus/isapnp.c b/src/drivers/bus/isapnp.c
index a19beb80..7903208d 100644
--- a/src/drivers/bus/isapnp.c
+++ b/src/drivers/bus/isapnp.c
@@ -653,11 +653,12 @@ static int isapnpbus_probe ( struct root_device *rootdev ) {
 
 			/* Allocate struct isapnp_device */
 			if ( ! isapnp )
-				isapnp = zalloc ( sizeof ( *isapnp ) );
+				isapnp = malloc ( sizeof ( *isapnp ) );
 			if ( ! isapnp ) {
 				rc = -ENOMEM;
 				goto err;
 			}
+			memset ( isapnp, 0, sizeof ( *isapnp ) );
 			isapnp->csn = csn;
 			isapnp->logdev = logdev;
 
diff --git a/src/drivers/bus/mca.c b/src/drivers/bus/mca.c
index 3f442111..375a6834 100644
--- a/src/drivers/bus/mca.c
+++ b/src/drivers/bus/mca.c
@@ -90,11 +90,12 @@ static int mcabus_probe ( struct root_device *rootdev ) {
 	for ( slot = 0 ; slot <= MCA_MAX_SLOT_NR ; slot++ ) {
 		/* Allocate struct mca_device */
 		if ( ! mca )
-			mca = zalloc ( sizeof ( *mca ) );
+			mca = malloc ( sizeof ( *mca ) );
 		if ( ! mca ) {
 			rc = -ENOMEM;
 			goto err;
 		}
+		memset ( mca, 0, sizeof ( *mca ) );
 		mca->slot = slot;
 
 		/* Make sure motherboard setup is off */
diff --git a/src/drivers/bus/pci.c b/src/drivers/bus/pci.c
index 1f0ad521..967441ac 100644
--- a/src/drivers/bus/pci.c
+++ b/src/drivers/bus/pci.c
@@ -245,11 +245,12 @@ static int pcibus_probe ( struct root_device *rootdev ) {
 
 			/* Allocate struct pci_device */
 			if ( ! pci )
-				pci = zalloc ( sizeof ( *pci ) );
+				pci = malloc ( sizeof ( *pci ) );
 			if ( ! pci ) {
 				rc = -ENOMEM;
 				goto err;
 			}
+			memset ( pci, 0, sizeof ( *pci ) );
 			pci->bus = bus;
 			pci->devfn = devfn;