diff --git a/t35_positronium_source/mac/Source_oPs.mac b/t35_positronium_source/mac/Source_oPs.mac
index e999399..b9c2624 100755
--- a/t35_positronium_source/mac/Source_oPs.mac
+++ b/t35_positronium_source/mac/Source_oPs.mac
@@ -12,7 +12,7 @@
 /gate/source/sourceA/setPositroniumFractions 1  
 /gate/source/sourceA/setPositroniumLifetimes 142 ns 
 /gate/source/sourceA/setDecayKinds k3Gamma 
-/gate/source/sourceA/setPromptPhotonProbabilites 0 
+/gate/source/sourceA/setPromptPhotonProbabilities 0 
 /gate/source/sourceA/setPromptPhotonEnergies 0 MeV
 
 
diff --git a/t35_positronium_source/mac/Source_oPs_prompt.mac b/t35_positronium_source/mac/Source_oPs_prompt.mac
index 5a04336..6085bbf 100755
--- a/t35_positronium_source/mac/Source_oPs_prompt.mac
+++ b/t35_positronium_source/mac/Source_oPs_prompt.mac
@@ -13,7 +13,7 @@
 /gate/source/sourceA/setPositroniumLifetimes 142 ns 
 /gate/source/sourceA/setDecayKinds k3Gamma 
 # Set enable emission of deexcitation gamma ( prompt gamma ) and its energy
-/gate/source/sourceA/setPromptPhotonProbabilites 1 
+/gate/source/sourceA/setPromptPhotonProbabilities 1 
 /gate/source/sourceA/setPromptPhotonEnergies 1000 keV
 
 
diff --git a/t35_positronium_source/mac/Source_pPs.mac b/t35_positronium_source/mac/Source_pPs.mac
index 449d97e..f27c7cd 100755
--- a/t35_positronium_source/mac/Source_pPs.mac
+++ b/t35_positronium_source/mac/Source_pPs.mac
@@ -12,7 +12,7 @@
 /gate/source/sourceA/setPositroniumFractions 1  
 /gate/source/sourceA/setPositroniumLifetimes 125 ps 
 /gate/source/sourceA/setDecayKinds k2Gamma 
-/gate/source/sourceA/setPromptPhotonProbabilites 0 
+/gate/source/sourceA/setPromptPhotonProbabilities 0 
 /gate/source/sourceA/setPromptPhotonEnergies 0 MeV
 
 
diff --git a/t35_positronium_source/mac/Source_pPs_prompt.mac b/t35_positronium_source/mac/Source_pPs_prompt.mac
index 2cec41d..0d909e7 100755
--- a/t35_positronium_source/mac/Source_pPs_prompt.mac
+++ b/t35_positronium_source/mac/Source_pPs_prompt.mac
@@ -13,7 +13,7 @@
 /gate/source/sourceA/setPositroniumLifetimes 125 ps 
 /gate/source/sourceA/setDecayKinds k2Gamma 
 # Set enable emission of deexcitation gamma ( prompt gamma ) and its energy
-/gate/source/sourceA/setPromptPhotonProbabilites 1 
+/gate/source/sourceA/setPromptPhotonProbabilities 1 
 /gate/source/sourceA/setPromptPhotonEnergies 1000 keV