diff --git a/src/mame/drivers/spectrum.cpp b/src/mame/drivers/spectrum.cpp
index ca897c31342..e701bdecd2b 100644
--- a/src/mame/drivers/spectrum.cpp
+++ b/src/mame/drivers/spectrum.cpp
@@ -718,7 +718,7 @@ INPUT_PORTS_END
 
 void spectrum_state::init_spectrum()
 {
-	m_specmem->space(AS_PROGRAM).install_ram(0x5b00, ram->size() + 0x3fff, m_ram->pointer() + 0x1b00);
+	m_specmem->space(AS_PROGRAM).install_ram(0x5b00, m_ram->size() + 0x3fff, m_ram->pointer() + 0x1b00);
 }
 
 MACHINE_RESET_MEMBER(spectrum_state,spectrum)